my OS windows7 browser is internet explorer. I right clicked and enable hardware acceleration did not come up.try right clicking on the video, going to settings on the menu that comes up, then unchecking the box that says "enable hardware acceleration." Not sure if that will do it, especially not knowing what OS and browser you're using.
Flash player has been really flaky on firefox since about mid june's update. Unsure of whether it is effecting IE, but if it forces my home pc to crash FF one more time I am moving to chrome or safari and never looking back.