Steam: Lockup, forced to restart computer

[Hypatian]

My latest attempted settings change was to disable Threaded Optimization on my nVidia driver for KB. No crashes yet, but I did have one graphical glitch (flickery icons floating above things) and immediately restarted the game. Can't ever prove a negative, but it's worth a try. I'll of course report back if I do crash later, but I have some other things to do right now.