$_GET[] not working

[Eddie Raps]

Trying to include the logged in user's username on our main page.

So, I have this

chdir('forums/'); 
require_once('forums/global.php');
chdir('../'); 

$username = $GLOBALS['vbulletin']->userinfo['username'];
$user_id = $GLOBALS['vbulletin']->userinfo['userid'];

But, somehow, including global.php makes any $_GET variable invalid... either shows blank or 0. Any idea why?

Nevermind. Included init.php instead of global.