Double check in the WA_Globals.php fiole that the settings for $WAGLOBAL_Gateway and $WAGLOBAL_Test_Mode are correct:
$WAGLOBAL_Gateway = 1; //Enter the appropriate value based on the above key. PayPal is specified by default.
$WAGLOBAL_Test_Mode = false;
Note: There should not be any quotes around the false for the $WAGLOBAL_Test_Mode.
if you are still having a problem, send a copy of the confirm.php page.