I've had this problem happen to me for seemingly no reason.
I restarted my phone, re-installed the game, cleared cache... this didn't really work.
After i restarted my phone for the 2nd or 3rd time it decided to work and has loaded fine since.
If you haven't already I would try restarting your phone, re-installing the game, clearing cache, etc.
If that doesn't fix anything then I'm out of suggestions. Good luck. =]