[nerbert]

I can never get it straight how error messages are controlled so in every project I build I put this at the top

ini_set('display_errors', 1);

If some file isn't available you'll get a "failed to open stream" error message. I assume you have somehow required global.php. It in turn requires several other files. Maybe global can't get the right path or something.

Then after your required files I would put in

echo 'userid = ' . $vbulletin->userinfo['userid'];

That way you can see if it knows who you are.