The problem started this afternoon when logging in - the main page was showing white everywhere except for the picture, but tapping it does let me into the My Quarters screen.
My Quarters works fine, I can brawl, rescue, story and everything else except get into the guild screen - when I tap that my screen goes white and stays that way, hitting the refresh circle doesn't work.
My guild was brawling pretty steadily this afternoon but it suddenly stopped, so I suspect this might not be limited - my wife is having the same problem.
Tried shutting down and restarting the phone completely but no luck.
Also posted on bug thread.