I'm not sure I see where you stated that you're using the simple registration form. You have both registration forms referenced in the second post you made.
Have you made additional modifications to the page or the database since I last posted? It looks like when I access the simple registration form, I get a sql error now. Here is the error I am getting on your simple registration form:
Unknown column 'UserID' in 'field list'
Could you attach the current code for that page?