Originally Posted by queenoid

This exact thing happened to me when I upgraded, as well! My iTunes is now set to my son's account. He graciously shared his password with me, and I am trying to figure out how to change back to my (much less interesting) iTunes account. I, as well, am flummoxed as to how the heck this happened.

To change it back...

Settings
iTunes & App Stores
Tap the AppleID
Sign Out
Tap the AppleID
Sign in

After upgrading my Ipad to OS6, it change the ID to my wife's Id, since we both use the same PC. I did a search on the internet and found many people with the exact same issue after upgrading to OS6 on an Ipad with two Itunes ID's on the same PC.

DerbyDad, your solution did not work for me because my Ipad has my correct ID in the settings but when I try and download and update to an App, it wants my wife's Id. ...Weird, it is like half of the Ipad using my ID and the other half uses my wifes ID. When I try and update an app, it still shows my wife's ID, even when I follow your suggested fix.

Originally Posted by gsouth

DerbyDad, your solution did not work for me because my Ipad has my correct ID in the settings but when I try and download and update to an App, it wants my wife's Id. ...Weird, it is like half of the Ipad using my ID and the other half uses my wifes ID. When I try and update an app, it still shows my wife's ID, even when I follow your suggested fix.

That is because the apps where bought using your wife's AppleID. That is how Apple manages licenses for the apps you acquire. It is almost the same as when you go to a store and buy a product with a credit card. You bring it home and everyone in the household can use it. But, if you all decide it is not what you need and return it, the store will credit back the credit card you used to purchase it.

Originally Posted by MattIM

That is because the apps where bought using your wife's AppleID. That is how Apple manages licenses for the apps you acquire. It is almost the same as when you go to a store and buy a product with a credit card. You bring it home and everyone in the household can use it. But, if you all decide it is not what you need and return it, the store will credit back the credit card you used to purchase it.

I think you may have missed the original issue. The problem is that the iPad changed the AppleID after the upgrade to
IOS6. In my case all apps our iPad2 were installed with my wife's AppleID. My AppleID was never used on the iPad.
However, as soon as we installed the IOS6 upgrade, using my wife's password as always, the iPad was suddenly signed in with my AppleId, the one I use for iTunes on my PC. I never signed onto the iPad with my AppleID -ever-, yet as soon as the upgrade was complete, my AppleID was showing in the iCloud account field. We had to sign out of my AppleID then sign back in with hers in order to get the iPad back to accepting her password for downloads again.

To use your analogy, it was as if we bought something on my wife's credit card, but when we went back to the store they had it listed under my name.