方法二: The simplest fix that should work for many people is as follows: 1.Close any Game Center enabled games 2.Open up Game Center 3.If you're logged in to a sandbox account, log out 4.If not, create a dummy sandbox account, then log out once done 5.Restart Game Center 6.Try to log in using your real account, that may fix things 7.If not, make sure you're logged out, then quit Game Center 8.Start a Game Center enabled game, and try to log in your real account Not that this is not a fix for all users, however retrying various of the above steps can eventually work..
方法三: (若之前未曾安裝AppSync, 則直接進行2..然後 Apps 挑一兩個有發生 SandBox 現象的遊戲移除即可) Here is a working summary of what fixed it for me: 1.Uninstall AppSync 2.Uninstall all the apps causing the problem (in my case legit/uncracked Angry Birds HD, Cut the Rope HD and World of Goo HD) 3.Update AppSync to latest version (from Hackulo.us) 4.Close all background running apps 5.Reinstall apps removed at 2. from Apps Store 6.Login to your real GameCenter account in the GameCenter standalone app (logout and relogin if it logs you in a SandBox account on first)