I'm only getting this on my main PC (HP Pavillion wth GTX 460) and my laptop (HP TouchSmart Tm2).
When I'm on a video on Youtube, I can only watch it in standard definition, when I try any other definition (lower or higher) the video is frozen on frame 1 and only the audio plays.
Is anyone else getting this and if so, is there a way to fix it? I've only noticed it on these two computers.