In WinXP Pro/FF 2.0.0.3, I am getting the unstyled XML file. I am able to bookmark the feed and bring it up, but there are no thumbnails displayed (not sure if that is an issue or if you have it set this way), and when I click on any of the links in the feed to go to the image, I can't reach them - the URL isn't any good. It reads:
http://index.php/?showimage=449. Are you sure you have your base URL set correctly in the admin section?
Also, the name of your feed keeps disappearing from my list everytime I close Sage and reopen it. The link is still there, but the title is gone.