new, encouraging report:
I found the properties panel for my vidcard, a v770 tnt2, and was able to disable 'fog tables' and to take down the '3D Turbo Gauge" down a notch from 5 to 4.
Since you mentioned fog tables as a suspected problem, I thought I'd try this, and, so far, so good.
Now I'm going to bump up the 'Gauge' to 5, but leave fog tables off..... I'll let you know what I find. BTW, I noticed no changes in CM's appearance. The only difference I noticed is that it's not crashing anymore.