C R A P!!!!
I can't believe what happened. I had my "online.txt" file linked to my live "online.cgi" file. Somehow the link got broken and turned into a regular file.
Grab the new version and the problem of people showing up as "username.inv" should go away.
Sorry about that!!! You'll notice the new version resolves the IP addresses as well.
Also, any other ideas for this script???