Not Redirecting to PayPal after update to 4.04?

I upgraded to 4.04 and for some reason when a user trys to sign up for a new account and "Register and Checkout" is clicked, the user is not redirected to PayPal. Rather, they are taken to a redirect page that they should not have access too and are automatically logged in which should also not happen. If you click the text "back" at the bottom of the page, and then complete the transaction, the paypal redirect works.

Please help? I was ready to go live with the site but now can't until this is resolved.

Kind Regards,

Seth