I have a site that uses Joomla 1.5 and Virtuemart 1.1.4. When a new user tries to submit their registration information, and clicks the "Send Registration" button, nothing happens. I have read about problems where the page just refreshes or directs to the homepage, but this one doesn't do anything.
You can visit the site here: [url removed, login to view]
Select a product and try to checkout. You will notice the issue as soon as you try to register a new account.