Gamecenter Problem

Whenever I try to log into the game, this gamecenter login screen appears, but it wont allow me to sign in or cancel. Whenever I close the app and restart it the process repeats, help PLEASE!

You get the Game Centre login screen? Maybe try to log into the Game Centre from the dedicated GC app? If it's linked to an old account, make a new one and link it to your current account and you shouldn't ever get this again on the account.

If this doesn't help, screenshots and/or more explanation of the problem will better help people help you.