After upgrading to iOS 5, and syncing the Apps, I lost the apps' data.
I found out that I have different AppleID for iTunes and GameCenter. So following RudyG's instructions:
I saw my AppleID for GameCenter.
On the iPod, I logged out of GameCenter, closed the App, and then reopen and resign in with my GameCenter ID. Now my games and achievements are all restored.
I'M HAVING A PROBLEM WITH GAME CENTER IN MY IPOD TOUCH 4 GEN !
I'M NOT ABLE TO VIEW MY ACCOUNT IN GAME CENTER. IT SAYS LOADING.. AND THEN IMMEDIATELY IT SAYS SAVING...
ONCE I VIEWED MY ACCOUNT AND I MADE CHANGES BUT IT SAID IT CANT SAVE
I CHANGED MY ACCOUNT IN IPHONE 4, I COULD VIEW MY ACCOUNT THERE.
COULD IT BE THE WORK OF SOME BUG IN MY IPOD TOUCH 4?!?
PLEASE HELP ME!!!