Eric Thanks for the info. The machines I am using are W98 SR2 and W2000proSr2.
Your comment encouraged me to do some more hunting.
It seems to only crash if the problem is set up with non-zero frequency.
The previous build did not do this, I ran the same model without issue.
Perhaps David can shed a little light on this?
Guy
-- David Meeker dmeeker@xxxxxxxx http://femm.berlios.de/dmeeker