[Dave]

Well again if $canadminusers variable is true then it should work because it skips that entire check. It is directly connected to "$this->hasAdminPermission('canadminusers')". If you edit that vBulletin script and add a var_dump($canadminusers); before line 2069 where the check is performed, does it show true or false? That way you can check if the admin user that is logged in is in fact allowed to alter users.

You can also assign the user the "super admin" role which you can assign in the /core/includes/config.php file in the $config['SpecialUsers']['superadmins'] variable. When it's in that variable, it will pass any kind of permission check.