Wow what a stupid bug to have. Does this happen with every Catalyst drivers package of only with certain ones? Also have you tried disabling GPU acceleration in flash? I heard that can cause the video card drivers to lock up. Also update flash to the latest version.
It seems to be every driver version, and GPU acceleration in Flash makes no difference (tried both ways). But it's not Flash-related--it's a problem with any video overlay. There's the same problem playing video in any other applications (Windows Media Player, Media Player Classic, etc.).
See
this thread on the Bitcoin Forum where it has been discussed extensively, along with
the official "GPU lockup if running OpenCL and playing video at the same time" thread on the AMD OpenCL forum. It was a problem a year ago with different cards and different drivers, and then resurfaced again now with the 6900 series.
Hmm, interesting. I did run across that AMD thread when I ran into a similar problem with my 5970. The system blue screened while I was trying to load a youtube video from within facebook. At the time I was running 11.2. What I did was run driver cleaner and install 11.3 after and update flash, turn off gpu acceleration - so far no crashes. Not sure if it was 11.3 that fixed it or what, but I do think this problem can happen with 5970 too. Has anyone else had this with the 5970 or am I the only one? (win 7 64)