Registered users aren't members?

[Dinocanid]

I added a usergroup (which nobody is currently in), but I haven't changed anything. I checked the usergroups and all of the members are registered. They're represented by numbers, so there aren't any capitalization errors.

I think I fixed the problem. It turned out to be related to my other thread about not being able to log out. They were getting the same error as me.