Just recently my registration form stopped redirecting users to the paypal payment page, and instead is just redirecting to my "thank you for submitting" message (which used to happen AFTER they paid at paypal). It was working fine when I first built the form, but my client wanted me to change the price options from a dropdown to a radio button choice. Seems after I did that the form stopped working.
As far as I can tell everything is good, including paypal IPN.
http://www.bigskyretreat.com/register/registration-form/
Need help ASAP. They're losing registrations each day.