New users can create new ID's with no problem. I just did it to test something out.

Originally Posted By: Celandine
It's come to my attention that a few acquaintances
of mine tried to join our forum but were unable to
either log-in or create a new account using older
versions of FireFox and Tiger(10.4?) on older Macs
that can no longer be updated.

Not sure why it would be an older browser issue, but maybe it is? Maybe if they went to say a library or friend's house, registered a new user there, then returned home and logged in with this new ID?