Category Feeds Not Working in WP 2.7

Category feeds are not working in the latest version of WordPress (2.7) For example, this feed is broken and defaults back to the main blog feed:

http://www.garagepunk.com/wp-feed.php?cat=7

Which reverts back to:

http://www.garagepunk.com/feed

Can someone please look into this? It was working fine up until this upgrade, and I use multiple category feeds on my site to deliver podcasts via RSS.

Thanks,
kopper