Problem updating apps after iOS 6 update
I had a similar problem trying to update apps because I live overseas in Japan, and after updating to iOS6 it defaulted to the Japanese AppStore. I went to the AppStore, clicked on view AppleID, then it asked for my password which was not recognized as a Japanese account, so after a few attempts, it switched me to the US store and now I can update everything.   Not sure if this will help, but following your steps helped me figure out the solution to my problem! Thanks!!