I (batch)changed a bunch of file permissions, and the /cache/supercache/mydomain.com/... directories have been accidentally marked as 755
WP-Super Cache was not able to delete/update the cached files, but it didn't say anything about it.
I realize that adding extra checks may affect performance, but on the other hand it might warn users of what's going on. Anyway, I thought that I'd send some feedback.
Thanks for the great plug-in