on the confirm page and the pp_confirm page, find the following lie:
$BurstSize = undefined;
$BurstTime = undefined;
$WaitTime = undefined;
and change it to:
$BurstSize = 200;
$BurstTime = 1;
$WaitTime = 1;
if you still have problems, add the following to line 1 of both pages:
<?php
error_reporting(E_ALL);
ini_set('display_errors','on');
?>