MMario, I don't think they're related either. Well, except if someone hasn't logged in for a while and doesn't like suddenly being called "guest," tries to log in and has problems. Maybe cookieless posters' names could just show up in a different color or italics, or just have an asterisk or something.
I've never had a cookie problem, (knock on wood) but if I did, I think the first thing I would do would be to ask for help. Seriously, I think cookie monsters mainly go after folks who are already members, not new people who are just becoming members.