[ThorstenA]

Thanks! This is what worked for me:

On showthread.php replace

PHP Code:

$navbar = render_navbar_template($navbits); 


with

	$templater = vB_Template::create('navbar');

	// Resolve the root segment
	$templater->register('bbmenu', $vbulletin->options['bbmenu']);

	$templater->register('ad_location', $GLOBALS['ad_location']);
	$templater->register('foruminfo', $GLOBALS['foruminfo']);
	$templater->register('navbar_reloadurl', $GLOBALS['navbar_reloadurl']);
              $templater->register('thread', $thread);
	$templater->register('navbits', $navbits);
	$templater->register('notices', $GLOBALS['notices']);
	$templater->register('notifications_menubits', $GLOBALS['notifications_menubits']);
	$templater->register('notifications_total', $GLOBALS['notifications_total']);
	$templater->register('pmbox', $GLOBALS['pmbox']);
	$templater->register('return_link', $GLOBALS['return_link']);
	$templater->register('template_hook', $GLOBALS['template_hook']);

	$navbar = $templater->render();