I've noticed that the adobe flash 10.1 beta breaks solutions which use the f-in-a-box for translucency. The swf displays the 1st frame but does not play. This issue can be reproduced by running your demo application - Sample04_Translucency.exe. Is something changed in Flash 10.1? How can I address this?
Adobe Flash 10.1 beta can be downloaded here.
http://labs.adobe.com/technologies/flashplayer10/