We need to get away from the Flash Tag for videos because it doesn't allow for very good mobile viewing. It also doesn't allow clicking on it to view it directly on Youtube and find more great videos.
I changed the Youtube tag to show the format the link should be in.http://www.youtube.com/watch?v=
If you watch a video on Youtube this should be a direct copy of the URL from the website bar. Put that website in between the youtube square brackets and closing brackets or click on the youtube button and paste the URL between the brackets.