[DS MrSinister]

If anyone is looking to get the NavTab back working without adding it to the Navigation Manager.
Login to the AdminCP --> Plugins & Products --> Pluging Manager --> vBExperience --> vBExperience (links)] --> process_templates_complete.

Just replace the code below..

if ($vbulletin->options['xperience_enabled'])
{
	if ($vbulletin->options['xperience_tabs'])
	{
		if (THIS_SCRIPT == 'xperience')  
		{
		    $vbulletin->options['selectednavtab'] = 'xperience_tab';
		}
		$template_hook['navtab_end'] .= vB_Template::create('xperience_tab')->render(); 
	}
}

Hopefully Phalynx will have better fixes soon..