I can't receive mail (messages), just a small blue screen with a blank tab lower middle. guide board..

Sounds like a bug. Assuming you have tried force closing the app or even restarting your device then you could check if the game needs an update, and if not then you could try reinstalling the game from your app store. Make sure you have bound your game to an IM30, google play or facebook account first though to allow you to recover it. Alternatively you could try checking with the developers for advice but they are hard to reach.

Same issues, nothing fixes it