I recently bought a new Iphone but i've been playing a game called clash of clans on my ipod. To link accounts on clash of clans between my iphone and ipod I need to sign into game center. If I open up my actual game center app on my ipod i'm signed in but if I try to sign into game center from clash of clans on my ipod it won't let me. When it doesn't let me it will open up the game center app and just stay there since i'm already signed in. I will then open up clash of clans again and it will say i'm not signed in again. Anything helps, thanks.