Windows 7: I.E.9 Beta and embedded videos

Using I.E.9 Beta on Windows 7 64bit. On various sites, embedded (flash) video is not viewable. All there is in its stead is a blank box with some small picture in upper left corner (not a red 'x', but something). It seems that it's mostly embedded YouTube videos (I can view many others that aren't YouTube). This isn't happening on all sites, tho as I can see the videos (embedded YouTube). This is happening only in I.E.9 beta 32bit and 64bit (even with the new update I got today). I can use Fx4 Beta 7 and Chrome and all is well. I've got the Square 2 flash in the 64 version of I.E. ... and in I.E.32 bit version, I've tried the standard Flash and the Square 2 version with the same results. Clicking compatibility view makes no difference.

Is this behavior just part of being beta? Or could there be other causes on my end?

Cheers,
Mark