I checked all that & cleaned about a little bit of stuff...still crashes.  I
run other stuff at 100% CPU load all the time (eg. seti@home) & never have
had any problems.  Maybe I'll try POV with less than 100% CPU allowed.
I've monitored CPU temps during the runs & they don't seem any different
with & without height fields (or between POV & any other high CPU use
program).

Anyway, it's something wrong with my computer (software or hardware).  For
now I'll stick with POV on my (slower) laptop.

Thanks!

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