I'm not sure whether this started after installing wordpress 2.9 or after importing a local wordpress instance onto the one I'm publishing online, but the media library on my live instance is bugging out whereas my local one works perfectly.
If I upload an image to my local instance, all proper thumbnails are created and the url of the main image is /wp-content/uploads/2009/12/DickEvans_PaulTellier.png.
If I upload an image to my live instance, no thumbnails are created and /wp-content/uploads/2009/12/DickEvans_PaulTellier.png shows "file not found" (even though the media library shows that to be the file URL).
The file is actually uploaded - I can tell because I can actually edit the file itself with wordpress's new image editor, I just can't see where it is on the server.
Any ideas what's going on here?