Please disable all plugins on your board and tell us if the problem persists.
To do this, edit your vBulletin config.php file currently on the server by adding the following line after the <?php line:
PHP Code:
Code:
define('DISABLE_HOOKS', true);
Then reupload the config.php file into your forum's includes folder.
Them fixes I gave you should of fixed the problem if the above does not work will give you something to put in your config to turn the warnings off