Would it be related to this I wonder Hippy;
Code:
// fix for lousy configurated vBulletin options as this eats some time in support...
if (strpos($forumpath,"index.php")===false)
{
// seems to be correct
}
else
{
$forumpath = str_replace("/index.php", "", $forumpath);
Tell you why - since the update my homepage [ by default and the cms ] is now
http://www.*****/content.php
NOT
http://www.******/index.php anymore...

Tried adjusting some settings in VB CP / Settings / URl etc to direct url and it does NOT like this address mate;
index.php?act=Arcade&do=newscore
Tried editing the Arcade.php file also to include forum.php / index.php / arcade.php to no avail.
Would this still apply;
http://www.vbadvanced.com/forum/showthread.php?t=45875
Checked the hooks all seems ok..