[calorie]

Oops, missed your hook location. Yes it's that b/c $show['member'] is not defined until after that hook. In global you'll see...

if ($vbulletin->userinfo['userid'])
{
	$show['guest'] = false;
	$show['member'] = true;
}
else
{
	$show['guest'] = true;
	$show['member'] = false;
}

So, instead of <if condition="$show[member]"> try...

<if condition="$bbuserinfo[userid]">