[Andreas]

Actually the last Post of every Page (that is not the first Page) disappears into Nirvana.
Explaining in detail why this does happen is not that easy, therefor i'll just post the fix

Hook: showthread_postbit_create

PHP Code:

if ($post['postid'] == $thread['firstpostid'] AND $vbulletin->GPC['pagenumber'] > 1)
{
    $counter--;
} 


Edit:
As this Hack already has Code on this Hook, replace that with

PHP Code:

if ($forum['showfirstpost'] AND $vbulletin->GPC['pagenumber'] > 1)
{
    if ($post['postid'] == $thread['firstpostid'])
    {
        $counter--;
        $post['postcount'] = '';
    }
    else
    {
        $post['postcount']--;
    }
}