I ran into a similar issue with the "My Location" field and the DFmaps module which was related to the relevant field in the users table being pre-filled for the Anonymous user. Looking at the users table again I note that there's a zero in the user_aim field so I guess that might be the cause of this problem?
Server specs (Server OS / Apache / MySQL / PHP / DragonflyCMS):
Dragonfly (9.3.4.1)