[YouTube-API] Video not playing in chromeless player over https in IE8

The application works fine in all browsers tested except for IE8. I'm loading the chromeless player using a swfLoader in flex 3 (loading https://www.youtube.com/apiplayer?version=3). I've added onReady, onError and onStateChange listeners to the player. The onReady event is firing in IE8, but neither the onError nor the onStateChange ever fires. 

Any idea on how to troubleshoot? I've seen lots of issues related to IE8 and the chromeless player, particularly over HTTPS, but nothing that gives me any actionable troubleshooting steps. 

An example of the issue can be seen in the flash widget at http://call2action.com, after clicking the play button.

Thanks.

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