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This was probably hanging around for a long time, it's not completely a XOOPS bug, but some "joint problem":
I use Mozilla 1.1a, which has a password manager, to keep track of usernames and passwords, somehow like IE does. Now, I made it remember my name for my XOOPS site.
The problem is: if I don't watch enough, when I'm changing the details of some user, it replaces the username in the fields with MY name, and saves it without a complaint from xoops. Thus, I have 2 users with my name and can't login anymore (luckily, I have some direct db access on my provider's host). As far as I can tell, XOOPS checks, when a new user registers, that the login isn't already used. I think it should be the case also when modifying a user.
Regards,