[Gigablah]

Update: I set the user-agent to "Native" and the menu breaks.

Looks like the javascript for the vBulletin menu is not being loaded. It's actually scrubbed from the template.

Turns out that there's a conditional for this in default vBulletin code:

// turn off popups if they are not available to this browser
if ($vbulletin->options['usepopups'])
{
	if ((is_browser('ie', 5) AND !is_browser('mac')) OR is_browser('mozilla') OR is_browser('firebird') OR is_browser('opera', 7) OR is_browser('webkit') OR is_browser('konqueror', 3.2))
	{
		// use popups
	}
	else
	{
		// don't use popups
		$vbulletin->options['usepopups'] = 0;
	}
}

...wow.

I'll just remove the conditional around the script element. It should work now.