I cleared my cache, and can still see 'em..... BUT looking at the 'attachments' directory, I do a 'save as' to get the file name, and can't find it. avatar_753.png for Peter Jack. Maybe it has one of the encrypted names?
Also, logged out and came in as a Guest... still could see them.
WAIT! Krash got 51827.png as a filename.... there is an encrypted filename that starts with that:
51827_4eea9.... etc etc. Downloading it, that's the avatar. So it IS on the server.