I've got W3TC set up on one of my sites that uses thesis. One thing I'm noticing is that the Thesis theme calls "thumb.php" for each of the thumbnails for posts that you see on the category, tag, and home pages.
The problem I'm having is that W3TC doesn't seem to be caching these thumbnails that are generated with thumbs.php
I'm wondering how I can get W3TC to cache these images as well. Any ideas?