Clearchannel, the reason why the query is failing is because your referring script has no userid appended to the end of it. All ezbounce links (when appended to outgoing email from vbulletin) have a userid appended to the end of the ezbounce header like this:
http://mydomain.com/forums/admincp/e...e.php?u=923998
where 923998 would be the userid of the recipient whom the email was originally sent, and bounced.