Embedded movies won't show up

I noticed this problem when a friend of mine directed me to a
site with an embedded movie object:




http://psubuntu.com/installation-instructions/



There are a few issues here:

1. If I look at this site in IE7, it shows up with a red ''x''
icon for the reserved object dimensions

2. If I look at this in Firefox 2, it doesn't show up at all
- in fact, this is where we found the problem

3. Checking this in Opera 9, the movie appears correctly

4. My friend sent me the link to the actual youtube page with
the movie - I can see it just fine in all 3 browsers on that page




http://www.youtube.com/watch?v=7pnmxwZJFQQ%26amp;eurl=



5. If I view the source and navigate to the link in any of
the browsers, I'm able to see the movie

6. I've tried uninstalling and reinstalling all of my
browsers and Flash and still the same results



Has anyone ever seen anything like this? I'm shocked (but not
amazed) that this kind of thing would even happen in Windows XP.