Okay, I've got a clean install and I have someone playing with it to see if the error will come up.
I just became a user through the Threads admin panel, but when I went to the mambo page it still saw me as the admin user. Is this a limitation of the integration or did I just completely mess up the integration?
ETA: Is this the proper syntax for the link for registration:
http://www.theiconsortium.com/index.php?option=com_threadsintegration&task=register Because that it is the URL it takes me to when I click the new user link.
ETA Okay, I found out what I did wrong here. I had registrations turned off in Mambo.