User blog comment:Blackbird625/NO BLEEPING ACCESS TO KINGDOM! HELP!/@comment-16894369-20140428021029

The only way to guarantee it will connect again is to uninstall it and reinstall it again. This kind of glitch is happening to a lot of players all the time since the app is released ages ago and it's never fixed.

After I did some research, it turned out that changing Facebook passwords might have caused it. Or, Maybe the FB account is "blocking" the connection? (Check under "Settings")