[kh99]

Really? Hmm...what version do you have? I'm looking at vb4.20 PL2 and it looks like this:

$show['activemembers'] = ($vbulletin->options['activememberdays'] > 0 AND ($vbulletin->options['activememberoptions'] & 2)) ? true : false;

$ad_location['board_after_forums'] = vB_Template::create('ad_board_after_forums')->render();
$ad_location['board_below_whats_going_on'] = vB_Template::create('ad_board_below_whats_going_on')->render();

(the first $ad_location line is 634). That error is saying something is wrong with a -> being in the wrong place, so I don't see how it could be a problem with that comment.

You could just try re-uploading forum.php from the vb distribution.