Sorry to reply to myself, but I did a little more digging.<br><br>It's not related to enabling/disabling embedding as the example above played OK when embedded.<br><br>I did come across this indicating that some videos won't play with the older chromeless player because it can't show ads:<br>
<a href="http://apiblog.youtube.com/2010/10/actionscript-2-chromeless-player-and.html">http://apiblog.youtube.com/2010/10/actionscript-2-chromeless-player-and.html</a><br><br>I don't know how to definitively tell if a video is "monetized" short of uploading some myself, but I'm pretty sure this is it.<br>
<br>If I have a chance, I'll try to dig into the new APIs to see how complicated fixing this would be.<br><br>-Alex<br>