I'm not sure if this is the problem, but I did draw the pieces shown approx. *6,000 light years* from the origin point. LOL
That might have confused a lesser program such as AutoCAD. =P

I've moved everything to the origin point and redid the conversion. Let's see what they say.

Perhaps an "option" for future versions of the 3DM to DXF converter would be to "move all objects to origin point"?

Chris