So ever since I updated to ios 7 beta 4, everytime I open angry birds, it would ask me to sign into the iTunes Store once or twice. After I sign in, it doesn't do anything, and if I cancel the request, nothing happens either. I tried to toy around with iTunes settings on my phone and Game Center - signing out back in etc, but nothing seems to work. The iTunes sign in pop up just keeps on coming, but I noticed that it only happens with the regular version of angry birds, and not the others. I'm not sure if it's a problem with the app or something between the app and the OS. But does this happen to anyone else?