What has changed in vb since vb407?

[Hippy]

ever since the latest vb's have been released
this script no longer works.
this script suppose to hold the session of the game being played so you gon't get loggd out
but something changed in vb4.08 to current and it don't work..
now unless you have remember me ticked you get logged out
this code works with vb3 and up to vb4.0.7 still
so it was a change in the vb's session I would have to guess..

<?php
define('VB_AREA', 'Forum'); 
define('THIS_SCRIPT', 'holdsession'); 
require('./includes/init.php'); 
if (empty($vbulletin)) 
{ 
// this is vBulletin 3.0.x 
// must load functions.php and initialize session as it is not done automatically 
require('./includes/functions.php'); 
require('./includes/sessions.php'); 
$session['sessionurl_q'] = "?$session[sessionurl]"; 
} 
else 
{ 
$vboptions =& $vbulletin->options; 
$session =& $vbulletin->session->vars; 
$bbuserinfo =& $vbulletin->userinfo; 
} 
$gameid = intval($_POST['gameid']);
$secs = $vboptions['cookietimeout'] - 60; 
if ($secs < 60) 
{ 
$secs = 60; 
}
echo "<meta http-equiv=\"refresh\" content=\"$secs; URL=\"$vboptions[bburl]/holdsession.php$session[sessionurl_q]act=arcade&do=play&gameid=$gameid\">";
?>

any help with this matter would be greatly appriecated