I try to play songs in iTunes (ver. 9.0.2) on my MacBook Pro (OS X.5.8) and some (note all) won't play and a box pops up and says: "This computer is not authorized to play "(song title here)". Would you like to authorized it?" I type in my password and then is says: "You cannot authorized more than 5 computers. Makes sense, except to my knowledge, this is the only computer that I have authorized and the only computer I use. I tried to repair the permissions and some iTunes things did come up but I've restarted iTunes and am still having the same problem. Also, the songs that won't play are ones I purchased, but there are some songs that I bought that I can play. Any thoughts??