[nerbert]

I'm sure $vbulletin->userinfo['userid'] is available on any file in the forum folder. Perhaps you have a typo.

I would try this:

PHP Code:

if($vbulletin->userinfo['userid'] ==  ### PUT YOUR USERID HERE ###)
{
     if($_REQUEST['do'] == 'postreply')
     {
           echo "usable hook";
     }
} 


Try this in various hooks in newreply.php, I would guess the first hook available would do it. Then post test replies to a test thread.