Can you try again? RSFirewall was configured to convert email addresses to images, and on the registration page, we use the email address in one of the hidden fields. So, it was converting that hidden field data into a hidden image and screwing things up.
In the "Active Scanner" area or RSFirewall, I disabled the "Convert email addresses from plain text to images" setting. Things look good, but I didn't go all the way through with registration.
Let me know how that goes.
Thanks,
Alex