Have you set wmode for your media BB Code?
http://xenforo.com/community/threads/video-object-and-iframe-get-in-the-way.20449/
<object width="500" height="300" data="http://www.youtube.com/v/{$id}&fs=1" type="application/x-shockwave-flash">
<param name="movie" value="http://www.youtube.com/v/{$id}&fs=1" />
<param name="allowFullScreen" value="true" />
<param name="wmode" value="opaque" />
<embed src="http://www.youtube.com/v/{$id}&fs=1" type="application/x-shockwave-flash" allowfullscreen="true" wmode="opaque" width="500" height="300" />
</object>
Excellent, thank you. That has cured it.Try changing it to <param name="wmode" value="transparent" />
Or better still, use the iframe version.
Code:<iframe width="640" height="390" src="http://www.youtube.com/embed/{$id}?wmode=opaque" frameborder="0" allowfullscreen></iframe>
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