Gleb

аааааа! ты лучший! куда спасибо скинуть?)
очистка таблицы решила проблему, но тем не менее надо бы разобраться, как правильно назначать права контент-менеджерам, но уж с этим как-нибудь, думаю, разберусь))

лог
давайте пощадим сюда зашедших))

[2019-11-15 16:54:01] (DEBUG @ /var/www/u0859369/data/www/idplitka.ru/core/model/modx/modaccessibleobject.class.php : 220) policy Array
(
    [modAccessCategory] => Array
        (
            [6] => Array
                (
                    [0] => Array
                        (
                            [principal] => 2
                            [authority] => 0
                            [policy] => Array
                                (
                                    [load] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 
                                )

                        )

                )

        )

)

[2019-11-15 16:54:01] (INFO @ /var/www/u0859369/data/www/idplitka.ru/core/model/modx/modaccessibleobject.class.php : 40) Principal 0 does not have permission to load object of class modSnippet with primary key: 39
[2019-11-15 16:54:01] (ERROR @ /var/www/u0859369/data/www/idplitka.ru/core/components/pdotools/model/pdotools/pdotools.class.php : 345) [pdoTools] Could not load snippet "msProducts"
[2019-11-15 16:54:01] (DEBUG @ /var/www/u0859369/data/www/idplitka.ru/core/model/modx/modaccessibleobject.class.php : 220) policy Array
(
    [modAccessCategory] => Array
        (
            [8] => Array
                (
                    [0] => Array
                        (
                            [principal] => 0
                            [authority] => 9999
                            [policy] => Array
                                (
                                    [load] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 
                                )

                        )

                    [1] => Array
                        (
                            [principal] => 2
                            [authority] => 0
                            [policy] => Array
                                (
                                    [load] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 
                                )

                        )

                )

        )

)

Если я правильно понял…

+ про сессии он тож чот писал

пробежавшись по массиву, не обнаружил ничего примечательного(признаться, я и не знаю, чего искать)))
вот часть распечатанного дампа…
<cut/>

[2019-11-15 16:54:01] (DEBUG @ /var/www/u0859369/data/www/idplitka.ru/core/model/modx/modaccessibleobject.class.php : 220) policy Array
(
    [modAccessContext] => Array
        (
            [web] => Array
                (
                    [0] => Array
                        (
                            [principal] => 0
                            [authority] => 9999
                            [policy] => Array
                                (
                                    [load] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 
                                )

                        )

                    [1] => Array
                        (
                            [principal] => 1
                            [authority] => 0
                            [policy] => Array
                                (
                                    [about] => 1
                                    [access_permissions] => 1
                                    [actions] => 1
                                    [change_password] => 1
                                    [change_profile] => 1
                                    [charsets] => 1
                                    [class_map] => 1
                                    [components] => 1
                                    [content_types] => 1
                                    [countries] => 1
                                    [create] => 1
                                    [credits] => 1
                                    [customize_forms] => 1
                                    [dashboards] => 1
                                    [database] => 1
                                    [database_truncate] => 1
                                    [delete_category] => 1
                                    [delete_chunk] => 1
                                    [delete_context] => 1
                                    [delete_document] => 1
                                    [delete_eventlog] => 1
                                    [delete_plugin] => 1
                                    [delete_propertyset] => 1
                                    [delete_role] => 1
                                    [delete_snippet] => 1
                                    [delete_template] => 1
                                    [delete_tv] => 1
                                    [delete_user] => 1
                                    [directory_chmod] => 1
                                    [directory_create] => 1
                                    [directory_list] => 1
                                    [directory_remove] => 1
                                    [directory_update] => 1
                                    [edit_category] => 1
                                    [edit_chunk] => 1
                                    [edit_context] => 1
                                    [edit_document] => 1
                                    [edit_locked] => 1
                                    [edit_plugin] => 1
                                    [edit_propertyset] => 1
                                    [edit_role] => 1
                                    [edit_snippet] => 1
                                    [edit_template] => 1
                                    [edit_tv] => 1
                                    [edit_user] => 1
                                    [element_tree] => 1
                                    [empty_cache] => 1
                                    [error_log_erase] => 1
                                    [error_log_view] => 1
                                    [events] => 1
                                    [export_static] => 1
                                    [file_create] => 1
                                    [file_list] => 1
                                    [file_manager] => 1
                                    [file_remove] => 1
                                    [file_tree] => 1
                                    [file_update] => 1
                                    [file_upload] => 1
                                    [file_unpack] => 1
                                    [file_view] => 1
                                    [flush_sessions] => 1
                                    [frames] => 1
                                    [help] => 1
                                    [home] => 1
                                    [import_static] => 1
                                    [languages] => 1
                                    [lexicons] => 1
                                    [list] => 1
                                    [load] => 1
                                    [logout] => 1
                                    [logs] => 1
                                    [menus] => 1
                                    [menu_reports] => 1
                                    [menu_security] => 1
                                    [menu_site] => 1
                                    [menu_support] => 1
                                    [menu_system] => 1
                                    [menu_tools] => 1
                                    [menu_user] => 1
                                    [messages] => 1
                                    [namespaces] => 1
                                    [new_category] => 1
                                    [new_chunk] => 1
                                    [new_context] => 1
                                    [new_document] => 1
                                    [new_document_in_root] => 1
                                    [new_plugin] => 1
                                    [new_propertyset] => 1
                                    [new_role] => 1
                                    [new_snippet] => 1
                                    [new_static_resource] => 1
                                    [new_symlink] => 1
                                    [new_template] => 1
                                    [new_tv] => 1
                                    [new_user] => 1
                                    [new_weblink] => 1
                                    [packages] => 1
                                    [policy_delete] => 1
                                    [policy_edit] => 1
                                    [policy_new] => 1
                                    [policy_save] => 1
                                    [policy_template_delete] => 1
                                    [policy_template_edit] => 1
                                    [policy_template_new] => 1
                                    [policy_template_save] => 1
                                    [policy_template_view] => 1
                                    [policy_view] => 1
                                    [property_sets] => 1
                                    [providers] => 1
                                    [publish_document] => 1
                                    [purge_deleted] => 1
                                    [remove] => 1
                                    [remove_locks] => 1
                                    [resource_duplicate] => 1
                                    [resourcegroup_delete] => 1
                                    [resourcegroup_edit] => 1
                                    [resourcegroup_new] => 1
                                    [resourcegroup_resource_edit] => 1
                                    [resourcegroup_resource_list] => 1
                                    [resourcegroup_save] => 1
                                    [resourcegroup_view] => 1
                                    [resource_quick_create] => 1
                                    [resource_quick_update] => 1
                                    [resource_tree] => 1
                                    [save] => 1
                                    [save_category] => 1
                                    [save_chunk] => 1
                                    [save_context] => 1
                                    [save_document] => 1
                                    [save_plugin] => 1
                                    [save_propertyset] => 1
                                    [save_role] => 1
                                    [save_snippet] => 1
                                    [save_template] => 1
                                    [save_tv] => 1
                                    [save_user] => 1
                                    [search] => 1
                                    [set_sudo] => 1
                                    [settings] => 1
                                    [sources] => 1
                                    [source_delete] => 1
                                    [source_edit] => 1
                                    [source_save] => 1
                                    [source_view] => 1
                                    [steal_locks] => 1
                                    [tree_show_element_ids] => 1
                                    [tree_show_resource_ids] => 1
                                    [undelete_document] => 1
                                    [unlock_element_properties] => 1
                                    [unpublish_document] => 1
                                    [usergroup_delete] => 1
                                    [usergroup_edit] => 1
                                    [usergroup_new] => 1
                                    [usergroup_save] => 1
                                    [usergroup_user_edit] => 1
                                    [usergroup_user_list] => 1
                                    [usergroup_view] => 1
                                    [view] => 1
                                    [view_category] => 1
                                    [view_chunk] => 1
                                    [view_context] => 1
                                    [view_document] => 1
                                    [view_element] => 1
                                    [view_eventlog] => 1
                                    [view_offline] => 1
                                    [view_plugin] => 1
                                    [view_propertyset] => 1
                                    [view_role] => 1
                                    [view_snippet] => 1
                                    [view_sysinfo] => 1
                                    [view_template] => 1
                                    [view_tv] => 1
                                    [view_unpublished] => 1
                                    [view_user] => 1
                                    [workspaces] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 1
                                )

                        )

                    [2] => Array
                        (
                            [principal] => 2
                            [authority] => 0
                            [policy] => Array
                                (
                                    [about] => 1
                                    [access_permissions] => 1
                                    [actions] => 1
                                    [change_password] => 1
                                    [change_profile] => 1
                                    [charsets] => 1
                                    [class_map] => 1
                                    [components] => 1
                                    [content_types] => 1
                                    [countries] => 1
                                    [create] => 1
                                    [credits] => 1
                                    [customize_forms] => 1
                                    [dashboards] => 1
                                    [database] => 1
                                    [database_truncate] => 1
                                    [delete_category] => 1
                                    [delete_chunk] => 1
                                    [delete_context] => 1
                                    [delete_document] => 1
                                    [delete_eventlog] => 1
                                    [delete_plugin] => 1
                                    [delete_propertyset] => 1
                                    [delete_role] => 1
                                    [delete_snippet] => 1
                                    [delete_template] => 1
                                    [delete_tv] => 1
                                    [delete_user] => 1
                                    [directory_chmod] => 1
                                    [directory_create] => 1
                                    [directory_list] => 1
                                    [directory_remove] => 1
                                    [directory_update] => 1
                                    [edit_category] => 1
                                    [edit_chunk] => 1
                                    [edit_context] => 1
                                    [edit_document] => 1
                                    [edit_locked] => 1
                                    [edit_plugin] => 1
                                    [edit_propertyset] => 1
                                    [edit_role] => 1
                                    [edit_snippet] => 1
                                    [edit_template] => 1
                                    [edit_tv] => 1
                                    [edit_user] => 1
                                    [element_tree] => 1
                                    [empty_cache] => 1
                                    [error_log_erase] => 1
                                    [error_log_view] => 1
                                    [events] => 1
                                    [export_static] => 1
                                    [file_create] => 1
                                    [file_list] => 1
                                    [file_manager] => 1
                                    [file_remove] => 1
                                    [file_tree] => 1
                                    [file_update] => 1
                                    [file_upload] => 1
                                    [file_unpack] => 1
                                    [file_view] => 1
                                    [flush_sessions] => 1
                                    [frames] => 1
                                    [help] => 1
                                    [home] => 1
                                    [import_static] => 1
                                    [languages] => 1
                                    [lexicons] => 1
                                    [list] => 1
                                    [load] => 1
                                    [logout] => 1
                                    [logs] => 1
                                    [menus] => 1
                                    [menu_reports] => 1
                                    [menu_security] => 1
                                    [menu_site] => 1
                                    [menu_support] => 1
                                    [menu_system] => 1
                                    [menu_tools] => 1
                                    [menu_user] => 1
                                    [messages] => 1
                                    [namespaces] => 1
                                    [new_category] => 1
                                    [new_chunk] => 1
                                    [new_context] => 1
                                    [new_document] => 1
                                    [new_document_in_root] => 1
                                    [new_plugin] => 1
                                    [new_propertyset] => 1
                                    [new_role] => 1
                                    [new_snippet] => 1
                                    [new_static_resource] => 1
                                    [new_symlink] => 1
                                    [new_template] => 1
                                    [new_tv] => 1
                                    [new_user] => 1
                                    [new_weblink] => 1
                                    [packages] => 1
                                    [policy_delete] => 1
                                    [policy_edit] => 1
                                    [policy_new] => 1
                                    [policy_save] => 1
                                    [policy_template_delete] => 1
                                    [policy_template_edit] => 1
                                    [policy_template_new] => 1
                                    [policy_template_save] => 1
                                    [policy_template_view] => 1
                                    [policy_view] => 1
                                    [property_sets] => 1
                                    [providers] => 1
                                    [publish_document] => 1
                                    [purge_deleted] => 1
                                    [remove] => 1
                                    [remove_locks] => 1
                                    [resource_duplicate] => 1
                                    [resourcegroup_delete] => 1
                                    [resourcegroup_edit] => 1
                                    [resourcegroup_new] => 1
                                    [resourcegroup_resource_edit] => 1
                                    [resourcegroup_resource_list] => 1
                                    [resourcegroup_save] => 1
                                    [resourcegroup_view] => 1
                                    [resource_quick_create] => 1
                                    [resource_quick_update] => 1
                                    [resource_tree] => 1
                                    [save] => 1
                                    [save_category] => 1
                                    [save_chunk] => 1
                                    [save_context] => 1
                                    [save_document] => 1
                                    [save_plugin] => 1
                                    [save_propertyset] => 1
                                    [save_role] => 1
                                    [save_snippet] => 1
                                    [save_template] => 1
                                    [save_tv] => 1
                                    [save_user] => 1
                                    [search] => 1
                                    [set_sudo] => 1
                                    [settings] => 1
                                    [sources] => 1
                                    [source_delete] => 1
                                    [source_edit] => 1
                                    [source_save] => 1
                                    [source_view] => 1
                                    [steal_locks] => 1
                                    [tree_show_element_ids] => 1
                                    [tree_show_resource_ids] => 1
                                    [undelete_document] => 1
                                    [unlock_element_properties] => 1
                                    [unpublish_document] => 1
                                    [usergroup_delete] => 1
                                    [usergroup_edit] => 1
                                    [usergroup_new] => 1
                                    [usergroup_save] => 1
                                    [usergroup_user_edit] => 1
                                    [usergroup_user_list] => 1
                                    [usergroup_view] => 1
                                    [view] => 1
                                    [view_category] => 1
                                    [view_chunk] => 1
                                    [view_context] => 1
                                    [view_document] => 1
                                    [view_element] => 1
                                    [view_eventlog] => 1
                                    [view_offline] => 1
                                    [view_plugin] => 1
                                    [view_propertyset] => 1
                                    [view_role] => 1
                                    [view_snippet] => 1
                                    [view_sysinfo] => 1
                                    [view_template] => 1
                                    [view_tv] => 1
                                    [view_unpublished] => 1
                                    [view_user] => 1
                                    [workspaces] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 1
                                )

                        )

                )

        )

)

[2019-11-15 16:54:01] (DEBUG @ /var/www/u0859369/data/www/idplitka.ru/core/model/modx/modaccessibleobject.class.php : 220) policy Array
(
    [modAccessCategory] => Array
        (
            [9] => Array
                (
                    [0] => Array
                        (
                            [principal] => 0
                            [authority] => 9999
                            [policy] => Array
                                (
                                    [load] => 1
                                    [list] => 1
                                    [view] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 
                                )

                        )

                    [1] => Array
                        (
                            [principal] => 2
                            [authority] => 0
                            [policy] => Array
                                (
                                    [load] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 
                                )

                        )

                )

        )

)

[2019-11-15 16:54:01] (DEBUG @ /var/www/u0859369/data/www/idplitka.ru/core/model/modx/modaccessibleobject.class.php : 220) policy Array
(
    [modAccessCategory] => Array
        (
            [9] => Array
                (
                    [0] => Array
                        (
                            [principal] => 0
                            [authority] => 9999
                            [policy] => Array
                                (
                                    [load] => 1
                                    [list] => 1
                                    [view] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 
                                )

                        )

                    [1] => Array
                        (
                            [principal] => 2
                            [authority] => 0
                            [policy] => Array
                                (
                                    [load] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 
                                )

                        )

                )

        )

)

[2019-11-15 16:54:01] (DEBUG @ /var/www/u0859369/data/www/idplitka.ru/core/model/modx/modaccessibleobject.class.php : 220) policy Array
(
    [modAccessCategory] => Array
        (
            [9] => Array
                (
                    [0] => Array
                        (
                            [principal] => 0
                            [authority] => 9999
                            [policy] => Array
                                (
                                    [load] => 1
                                    [list] => 1
                                    [view] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 
                                )

                        )

                    [1] => Array
                        (
                            [principal] => 2
                            [authority] => 0
                            [policy] => Array
                                (
                                    [load] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 
                                )

                        )

                )

        )

)

[2019-11-15 16:54:01] (DEBUG @ /var/www/u0859369/data/www/idplitka.ru/core/model/modx/modaccessibleobject.class.php : 220) policy Array
(
    [modAccessCategory] => Array
        (
            [8] => Array
                (
                    [0] => Array
                        (
                            [principal] => 0
                            [authority] => 9999
                            [policy] => Array
                                (
                                    [load] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 
                                )

                        )

                    [1] => Array
                        (
                            [principal] => 2
                            [authority] => 0
                            [policy] => Array
                                (
                                    [load] => 1
                                    [formit] => 1
                                    [formit_encryptions] => 
                                )

                        )

                )

        )

)

оооо, кажется, что-то проясняется)

но что есть principal 0?

Привет! Спасибо за ответ.
В общем, настройки политики у меня ровно такие же, как на твоём скриншоте (хотя пробовал разные комбинации). Кор/кэш чистил, разумеется, неоднократно, результата, увы, не даёт.
В плане хостинга тоже маловероятно, т.к. на локалке у меня тоже такое было (да и всё-таки хоть какое-то логичное объяснение быть должно).
Может есть ещё предположения?