I have the administrator role, but I cannot enter here Users->User Role Editor. I can not enter neither from wordpress menu (because it doesn’t appear), nor from plugin > user role > settings
I’m not using the menu plugin “Admin Menu Editor”
If this is applicable, you may send admin login credentials to support[at-sign] role-editor.com (better if you have a stage copy of the site). I will investigate this.
Look now. I just deactivated and activated back User Role Editor as have recommended before. It restored its own user capabilities for administrator role and became available again.
If it may be related somehow – I deactivated and activated back the “Menu Items Visibility Control” plugin also, thinking it works for back-end, not for front-end.