I have a macbook air with mavericks. I was I have a seperate install of mavericks no an external thunderbolt SSD. I installed it and run with with no problem. But I was trying to run some music from itunes the other day and it said that itunes was no authorized. When I try and authorize it it says the computer has already been authorized. I assume it has something to do with how itunes checks auth, and that the computer has been authorized but the external ssd has not. Can anybody help me straighten this out. thanks.