[Plugin: WP Super Cache] Empty Cache File List

Running WP Super Cache 0.9.9.9 with WP 3.2.1:

When I go to the Contents tab, the list of files in the cache is always empty, never has anything listed there. There seems to be no difference in the website load times, but it is still very basic so there isn’t exactly a lot of data that can be cached anyway…

Checking the source code, I do see this at the end of each page:
<!– Dynamic page generated in 0.576 seconds. –>
<!– Cached page generated by WP-Super-Cache on 2011-09-08 19:13:23 –>

So the plugin definitely is enabled and doing something… Any idea what’s up with the list of cached files though..?

http://wordpress.org/extend/plugins/wp-super-cache/