[Plugin: WP Super Cache] Can't clear cache (wp-cache)

When I go to ?page=wpsupercache&tab=contents I see the following stats:

Cache stats last generated: 5 minutes ago.

WP-Cache (274.83KB)

    10 Cached Pages
    0 Expired Pages

WP-Super-Cache (0KB)

    0 Cached Pages
    0 Expired Pages

List all cached files

Garbage Collection
Last GC was 05:33 minutes ago
Next GC in 04:27 minutes

I can’t seem to get rid of those 10 cached pages.

Note that I don’t have any fancy stuff on the server, like APC, Memcache etc.

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