Board Thread:Support Requests - Getting Technical/@comment-16319418-20150808174653/@comment--20150809123527

Check your Special:Preferences under "editing" and look at the very bottom where it says "Starting an edit" and make sure the box that says "Disable Category module (only applies if visual mode editing is disabled)" is unchecked. If that isn't working then go ahead and ask Staff Special:Contact/bug is no one else replies here.