I went back to the released version of Flash 10, and everything works.  It looks like Flash 10.1 Beta 2 doesn't work.  Most people are having trouble playing 1080p Flash video(YuoTube).  Also Flash video on cell phones, etc.  So Adobe finally got serious about Flash performance.  Adobe added GPU acceleration to speed up Flash video.  My guess is this will be the default Flash player by the end of the quarter.  There is a good article at AnandTech about it.

www.anandtech.com/video/showdoc.aspx

-K