Dave, sorry I could not get back sooner, I had to step out for several days.
Anyway, to answer your question I have used precision of 9, 5, 1,0.1, 0.5, 0.9.
makes no difference.
But since I asked the question last year, I have changed the units from lbs/cf to g/cm3 and looks like that will help.
again, sorry I did not thank you earlier.

I am trying to use Center of Gravity v1.7 to design RC air planes using balsa wood with a density of 5lb/ft3. `volumes in the range of 7 cubic inches. when I run c of g it gives a volume of 0.0 ft3 and a Weight of 0.0 lbs. I suspect the volumes and densities are too small for c of g to calculate. I suspect the program is designed to work with larger (much lager) models.
is there some way to adjust c of g to deal with lighter material and smaller volumes, it that is the problem?
thank you.