In many cases it is the wmode bug causing this. Make sure you have the red paragraphs in the code for the embedded object.
Code:
<object width="600" height="385">
<param name="movie" value="http://www.youtube.com/v/YvWywBxmDEg&hl=en_US&fs=1&"></param>
<param name="allowFullScreen" value="true"></param>
<param name="allowscriptaccess" value="always"></param>
<param name="wmode" value="transparent"></param>
<embed src="http://www.youtube.com/v/YvWywBxmDEg&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" wmode="transparent" width="600" height="385">
</embed>
</object>
Oh and by the way, if you also need the page to validate you can embed the youtube videos like this:
Code:
<object type="application/x-shockwave-flash" data="http://www.youtube.com/v/mZvRmE2NPjE&hl=en_US&fs=1&" width="600" height="385"><param name="allowFullScreen" value="true" /><param name="allowscriptaccess" value="always" /><param name="movie" value="http://www.youtube.com/v/mZvRmE2NPjE&hl=en_US&fs=1&" /><param name="FlashVars" value="playerMode=embedded" /><param name="wmode" value="transparent" /></object>
If this does not solve the problem you might want to post a link to the page.
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