[scotsmist]

The reason why there is a blank portal page when using this add-on is due to the followong code at the beginning of plugins/credits_plugin.php

if (!defined('VB_AREA'))
{
	exit;
}

The page is blank because VB_AREA is not defined. vbPortal is not a VB_AREA, but it does use THIS_SCRIPT constant. Changing the above code to

if (!defined('VB_AREA') AND !defined('THIS_SCRIPT'))
{
	exit;
}

stops the exit and displays vbPortal. Looking at the add-ons code, the credits.php page has THIS_SCRIPT defined, so the above change doesn't affect this page, but I haven't any experience with the add-on to know if more testing is needed to ensure that line doesn't have unexpected results.