I had to do a clean reinstall of my MAC OS, after restoring my iTunes library from Time Machine all the songs and apps are back but I cannot play any of my purchased songs or apps. iTunes keep on asking that I need to authorize the computer - which I have done using my Apple ID. When I play the song up comes the message box asking for Authorization I then do it and get a confirmation message box saying I'm already Authorized BUT I still cannot play the songs! I've contacted iTunes support and read all the Apple iTunes help and how-to's and they just say De-authorize and then Re-authorize as a Admin o the local computer (this I have all done). Apple support seems to be lost as I'm now being referred between different support numbers? Has anyone seen this or has any idea how to fix?