If you navigate to this URL: http://store.apple.com/us_smb_78313/business-center/test-your-setup what should happen is a popup should show up if you do not have quicktime installed, asking if you want to install it. What we are seeing is that the popup does not show up and you just get a page with a placeholder for video.
Any idea how we get this working?
Could be anything. Without knowledge of your ruleset, it would be difficult to know. If you have 7.3.2+, what do you see in the rule engine trace? If older, check your access log for blocks.