GarageBand '11 won't download additional loops

Hola,

I have GarageBand '11, running on Mac OS X 10.6 Snow Leopard. The Apple loops have lots of greyed-out loops that need downloading. I click to activate one, it tells me I must download the loop now or later. I click Now, it goes to Software Update which tells me there is nothing left to download because I am completely up to date. I restart GarageBand, and still the loops are missing.

It's very frustrating!

In my Software Update download history it says the loops have already been downloaded, yet GarageBand still can't see them.

Anybody got any idea what to do?

Thanks,

Graham