"Do not have permission to access the requested resource"

Hi,
When I try to access the "Home" and "Music" sections of the iTunes store, I get the following message.
"We could not complete your iTunes store request. You do not have permission to access the requested resource."
Note that all the other sections (movies, audiobooks, App store etc.) work fine.

Here's what I've tried to fix it, based on other support articles.
- Logout and login of iTunes store
- Reset of keychain.
- Enabling cookies in Safari.

I'm using iTunes 9.1.1
Cheers,
Andrew