First of all let me state that I have my credit card in hand and my security code, the card number, and the expiration date are perfectly valid. Also let me state that the billing address for the card exactly matches what is on my statement. I've read about this issue in other threads but it has been pre-5.1 and some even 4.0 so I'm not sure if the update is what's causing this problem. I was able to update all of my apps last night pre-the 5.1 upgrade however now it's telling me my security code is invalid when in fact I know it is not. Anyone else getting this issue? Anyone else have a fix for this issue? Could I just go to the genius bar and complain?