Well... there is no difference in that. I removed that particular email, got another bounced email just a few minutes ago, the link is like this:
Code:
X-Priority: 3
X-Mailer: vBulletin Mail via PHP
X-EZbouncer: http://www.myforms.com/board/admincp/ezbounce.php?u=31760
So seems nothing wrong with the link. Like I said, the link works and the user gets moved to the bounced users usergroup. Only the screen gets blank and IE says "ready".
Just to be sure if nothing else maybe caused a hickup, I will try tomorrow again with another email and then try with IE and with Firefox, just to make sure that IE is not the problem.