I'm using this plugin via WPSuperCache on multisite installation (with subdirectories). I noticed on another forum post that in order to properly cache the non-main sites' files, you should add "files" to the "include directories" setting. However, even when I do this, the CDN (cirrux cache) produces errors when getting these files.
For instance, one log message shows this request:
"GET /files/2011/07/CantorsAtticlLogo.png HTTP/1.1" 404 227 "http://boolesrings.org/victoriagitman/"
It seems like it is trying to look for it in "/files" instead of in "/victoriagitman/files". I'd appreciate any advice!