It is using ssl. It has been working fine for the last 6 months. When I added the options it is now not forwarding to checkout_success.php. We have ssl and I updated the line in cart.php
$ATC_RedirectAfter = "https://hotvws.com/cart.php";
It appears that everything is using ssl as it goes through the transaction.
The page it was hanging on was ssl too. webassist/ecart/checkout/ppadvforward.php