It looks like it is something to do with the flash and the code you are using. I did a quick example by coping a youtube video and it worked fine:
<div class="logo">
<object width="640" height="385"><param name="movie" value="http://www.youtube.com/v/auqUJY4mzAs?fs=1&hl=en_US"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/auqUJY4mzAs?fs=1&hl=en_US" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="640" height="385"></embed></object>
</div>