Possibly.

It might be related to the current flash player version itself rather than webKit, I am not sure but yes, when you press any button on the keyboard seems that there is no action for key-released triggered out. It's only key-pressed.
Using keyboard navigation, trying type in some text, the same behavior. The way how quickly HD keyboard triggering this to the flash player is incomparable to the normal PC one. Making the whole flash movie stuck.

Edit:
I am wondering, is any way that somebody with PR 1.1 could isolate flashplayer plugin and put somewhere to download? Regarding to performance issues of flash player inside the MicroB everything telling me that flash player in leaked PR 1.2 is completely screwed-up and just some experimental build.

here the files I am talking about

First file is
home/libflashplayer.so 10.3MB

Second
usr/lib/libflashplayer.so 5.6MB

Any advice where can I find the plug-in file that microB is using?
Or your webKit solution? The file in home seems to me like it's just kind of backup I don't remember such a file there before.

Edit 2:

But still I'm confused, I was able to play in current version of flash player and PR before... for example "penguins can fly" without any issues.