I do, frequently. The reason I wanted you to hunt up those files is those are what usually caused the lockup for me previously. Right after installing SR4, I rendered a scene of 300 frames with dynamics, wind, reflection and stupid shader tricks just to see what would happen. Took forever and a day (ie, all night) but it didn't crash :)

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)