Itunes computer authorization issue

I just downloaded some music from the itunes store to my itunes. When i tried to play the music i just purchased i got a prompt that said "this computer is not authorized to play this....authorize this computer"...this computer is authorized to play music i download from it tunes....ive got over 13,000 tracks in my itunes and it plays all the rest of them just fine. So, i went through the protocols to authorize this computer again...completed the task...it confirmed this computer had already been authorized. But, when i got to play the music i just purchased, i get the same prompt saying this computer is not authorized.

Anybody had this same problem?

Any solutions?