Since updating gl, inteldri and flash a few days ago, i experienced several times that viewing a flash movie on youtube leads to BSOD - the flash window becomes totally unresponsible, often with nothing drawn in it. I can not kill it using ctrl + alt + esc utility, so i have to log into a text session to do anything at all. Killing kwin does not help, neither does nsplugin. What i get from doing that is zoombies. Killing X helps, but not much, since after that networking is unusable, the networkmanager applet is then not able to connect. It comes up claiming that there is no network interfaces, i can then restart networkmanager, but the applet will not do anything at all. Only solution I found is to reboot.

I'm using archlinux, and they elected to update libgl and intel-dri to 7.10.0. I also got a flash update recently, so I do not know what causes this unfortunate situation.

Before this, I had problems exiting flash fullscreen, leading to kwin crashing, which I was told was related to a known bug in the intel or intel-dri driver.

Any solution to this? Maybe configuring dri somehow (seems to fix some issues with kwin and intel-dri)?

I found a workaound - disabling hardware accelleration in flash plugin settings (rightclick a flash movie to access). This seems to fix both the occational kwin crash during leaving fullscreen and this latest - worse - misbehavior.

I hope between intel and adobe, this could be fixed sometime in the future

Adobe just implemented a new hardware acceleration system for flash 10.2, which was almost certainly the update you saw.