The first issue was that the validation was set to entry length validation with a minimum of 5 characters for the SSN field, and your login only has 4 characters. Then the failed redirect didn't have a page name, so that caused the error you saw on the page.
I fixed that issue by updating the server validation server behavior on the login page.
The update user page had a syntax error in the recordset. I fixed that, but it appears it may be a bug in the extension, so I'm looking into that now and I'll try to get a fix out in the next day. For now your pages should be working again.