itunes is telling me my computer is not authorised to play an album?

I bought an album yesterday and tried to play it today. iTunes told me that I need to authorise the album before I can play it. I did, and it says i have authorised 3 out of my 5 computers. I clicked in the play button again but it still says I need to authorise it? I've typed in my apple ID and password 3 times now and it's still not working.