After update iOS 7 on my iPhone 4s, Game Center not working, nor are Game Center games. Tried deleting and reinstalling. Did not correct. Game Center is white screen. No login/out option.

After updating to iOS 7 last night on my iPhone 4s I have not been able to play any games that require Game Center ID to login. Specifically Dragonvale. When I attempted to go into Game Center to logout the Game Center goes to white screen and does not respond. When going into Settings/Game Center from Home Screen, it does not allow me to go into the Game Center settings there. I have tried deleting the apps that won't work and reinstalling them, still cannot log in and play/use them. Anyone else having this issue? Or have a fix for it? Apple, anything?