Category pages only display thumbnails and no title or excerpt

I am using the mystique theme with wordpess 3.1.3. and have added the tabbed sidebar to show blog posts by category, most commented etc etc.

The issue is, when I click on a category and it displays the category page, I only see a thumbnail with dividers for each posts, no title of excerpt whatsoever. On posts with no attached image, nothing is show for it, despite still being clickable.

http://www.geoffholder.com/?cat=11

there is an example. there should be three posts on that page, and only one image is displayed. If anyone can help it would be thoroughly appreciated!