So I have been having a similar problem but this is after I try syncing my iphone which is driving me crazy!!
I have been trying to sync my new iphone with my iTunes but even though my MacBook Pro is authorized (the only 1 computer that is authorized), a message pops up everytime saying:
"This computer is no longer authorized for apps that are installed on the iPhone “Merv’s iPhone”. Would you like to authorize this computer for items purchased from the iTunes Store?"
Then when I click on "Authorize" the box where its supposed to ask for my current Apple ID and password does not show up. Instead it asks for my old Apple ID's password. Right now I use my gmail but it keeps on filling the email section with my old hotmail account. I tried changing the password but I don't use hotmail anymore so I can't get in the account.
I also -everytime- delete the hotmail address and type in my current gmail address but after it says Im authorized, the same message saying "This computer isn't authorized" pops up again when I try syncing my iphone. I want to either cancel the old Apple ID or make this message stop filling the email section with my old email address.
What can I do to finally sync my iPhone?