I would try with all mods disabled then.
To temporarily disable all mods:
Open your
includes/config.php file and below<?php add this line:
PHP Code:
define('DISABLE_HOOKS', true);
So it looks like this:
PHP Code:
<?php
define('DISABLE_HOOKS', true);
/*================================================= =====================*\
|| ################################################## ################## ||
|| # vBulletin 4.2.2
Then see if the issue still persists.
After testing, then remove the define('DISABLE_HOOKS', true); from the
includes/config.php file