WordPress MU

Is anyone else having this issue where the path to a file in the media library is displayed instead of the media type? Here's a screenshot of what I mean.

http://joejacobs.org/media-path.png

I'm running WPMU on nginx. I've also got a self hosted version running on wpmu but no problems there.

bump

I'd say it was one of the nginx rewrite rules. I;d have to go look them up.