I think I found a solution on the SMM.EXE error problem. The surface model originated in a Pro-E file, and was IGES translated into Freeform for coding. Late Tuesday I found four surfaces that, for whatever reason, would not show a surface normal indicator but would render ok and was recognized when generating toolpath. I was intrigued by the lack of Normal indication and deleted the surfaces and made new replacement surfaces. The problem went away. I checked the Element Data info on the "unusual" surfaces and Freeform returned "Construction Method = Imported ACIS Spline (NURBS) Surface". That seemed normal, in conclusion all I can figure is that in the file translation some information was attached to these surfaces that Freeform did not read correctly. hmmmmmm Thanks to all replies, Michael
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