iTunes: "Your account was changed while you were editing your account information."

Solution 1:

I could see a race condition causing this briefly, but if you get this error for more than 15 minutes, I would get in queue with Apple support:

  • http://www.apple.com/support/ios/contact/
  • http://www.apple.com/support/systemstatus

Unless there is an outage, you'll likely need someone to assist you on the sever side to resolve these errors.