Disk usage not showing in web panel?

I recently added a second user to my account who has FTP access only, no shell, and I today logged in to the panel so I could see how much disk space he was using, as well as how much space I’m using, and the panel shows that both user accounts are using 0.000MB of space! I know this is not true, as I have probably around 13 gigs or so of stuff in my space, and my friend’s got some backups of his that are a few gig in total size in his. Any idea how I can find out what are disk usage is, since the web panel doesn’t seem to show it?

Sharing of data between two points on a computer network regardless of method used, is not a crime, don’t let the **AA’s tell you otherwise!