iTunes gone EVIL

Well this is by far one of the most frustrating thing I've had to deal with for a while with my mac. I just bought a few songs in the iTunes store and it wont let me play the songs. Instead it says I need to authorize the song, so I do and it tells me I did authorize it but when I try to play it, it gives me the same message. No clue what to do here hopefully somebody knows.

Give these tips a try. If that does not work let us know. I think I have seen a few other fixes but I can't find them at the moment.

My missus had something similar come up on he MBA, and after Authorising many times, i came in and pressed Cancel and she was fine. Not sure why this happened but by cancelling the request she was ok to play the song/update the App. Cant quite remember what exactly it happened on, but by pressing cancel it seemed to fix it.