Are you exporting from the model or from the drawing?
What I have been doing is creating the drawing in Draftsight, saving it as a DXF file and then loading it into MeshCAM for use by FabCAM in my desktop CNC machine.
I do not have to export it to use it.
What happens is that the drawing looks great in Draftsight, but when I load it into MeshCAM it informs me of no contour. I then have to go back into Draftsight and zoom in bigtime to find when the trim command did not completely trim the lines.
If there were a way or tool within Draftsight to check a drawing it would sure be a time saver.
Thanks for your help.