IOS6 UPDATE PROBLEMS?

I have the same issue, I can't log in. I click on my log in name at the bottom, the doughnut spins and then all of the sudden i'm staring at my lists of apps on my iphone. I actually had this problem right before i downloading the IOS upgrade. I downloaded the upgrade thinking it would solve the issue but no luck. I also deleted the app and reinstalled but still nothing. any suggestions?