Unable to sign in Sandbox gamecenter on iOS 7

Question

Since iOS 7 I no longer get the prompt from game center to ask me to log in sandbox mode when I open my application. I searched for a while and never saw any known issues ab

Answer 1

If you've cancelled game center sign in enough times, the OS disables game center for that game. Prior to iOS7, you could manually sign in again using the game center app, and when you launch your game again it would sign in.

However, in iOS7, it appears that when the OS disables game center for your game, it's completely disabled. I've found that using Settings > General > Reset > Reset All Settings will restore game center functionality for games that have been disabled in this manner.