I have had this problem for some time now, but I just blamed it on devs, Kongregate and anyone else in earshot. The problem seems to be with the flash player. Firstly key presses are not being treated as they should, they ether “stick” or “rapid fire” depending on the game, also the graphics “flash” in some games. And that dragon age game thing fails to run after loading, it just gives a blank screen.
Help!
(I’m using Ubuntu 9.10 and Firefox 3.5.something)