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If you've had your iPod jailbroken before, Apple says that is the reason...cuz there is leftover stuff from the jailbreak. They said they can't...
I think I'm gonna take it into an Apple Store and see what they can do..
Any luck yet?
SAME exact thing happened to me:/ I can't find it anywhere!!! I hope it's a bug that will be fixed with 4.0.1