Hi folks,
just to feedback and thank the guys who offered suggestions re the recent lockups i was getting. These occurred even on single player mode.
Found the problem. it seems that Gkrellm ( a desktop monitor prog ) was the source. Shutting it down before play completely stopped the freezes. No idea what it was doing tho.
particular thanks to the guy who patiently went thro process/memory monitoring with me during a game.
JFYI system is Athlon based, running Arch Linux, pekwm, with nvidia gfx.
cheers
Kern