Thread:Wikia/@comment-9336282-20150815050849/@comment-26009167-20150815092752

Have you tried manually navigating to the Special:UserLogout special page manually? If you have but it still didn't work, then a surefire way to ensure you get logged out is by clearing your browser's cookies. (though this will log you out of other sites such as Twitter or Facebook, too!)

If Special:UserLogout really does not work for you, I recommend sending this in as a bug report to Special:Contact/bug, though. Even if the problem later resolves itself, it's still a good idea to report anything that seems like a definite bug. :)