--- /includes/classes/observers/drupalzen_observer.php	Sat Mar 15 20:43:32 2008
+++ /includes/classes/observers/drupalzen_observer.php.new	Mon Mar 31 14:42:19 2008
@@ -123,7 +123,7 @@
       break;
       case 'NOTIFY_HEADER_START_CHECKOUT_PAYMENT':
         if( defined( 'DRUPAL_SINGLE_SIGNON' ) && DRUPAL_SINGLE_SIGNON && !$_SESSION['customer_default_address_id'] && !$_SESSION['billto'] && !$_SESSION['sendto'] ) {
-          zen_redirect( zen_href_link( 'checkout_billing_address' ) );
+          zen_redirect( zen_href_link( 'checkout_payment_address' ) );
         } else if ( $_SESSION['billto'] ) {
           $this->setPrimaryAddress( $_SESSION['billto'] );
         }