can't play

So i bought the app yesterday for my iphone 4, and by that time I couldn't erase anything, not even the name steve so i could write my own. After that i registered the name letxvsSTEVE17 but the chat is all black (screenshot). I can write and send messages, but can't see the chat while im writing.
And now, after the update I can't even enter any of the servers, because when i do enter i go straight to my ios menu and i have to open again the app. i can only enter my own world.