Exclamation [Q] Notifications permanently disabled!

I have no idea what happened. Notifications (like SMS emails apps etc) are no longer active/audible nor selectable or clickable. Third-party notification apps like IntelliRing do nothing. I restored all frozen applications with Titanium Backup Pro but nothing happens.

What do?


PS: The only application with many permissions recently used was Fences (now uninstalled).

(Rooted stock Jelly Bean 4.3)