Just clicking the "media could not be played - retry" button works, too.There's an interaction between YouTube and the media plug-in here on the forum where if you click on the preview to start the movie, it will tell you the video is unavailable. But if you explicitly click on the video title, it will take you to the YouTube page and play it there. I assume this is because YouTube is unhappy that people are playing their videos embedded on other sites, somehow messing up some part of their tracking/ad serving stuff.
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If you click the video itself out of habit and get YouTube's "Aww, too bad!" message, just refresh the page to reload the thumbnail and try again.
They're afraid your video is going to damage tender, young minds.