Occasionally when saving a 2D profile to DXF or DWG for laser or water jet cutting, arcs, circles and slots with radius corners will appear normal on my tube but when opened at the shop doing the work will be made of multiple splines, open splines with parts missing, and slots can be trapezoidal in shape, or circles made into a series of lines not even coming close to a circle.
This very same 3dm file saved again as a DXF or DWG the next day will open fine at the different shops that is doing the water jet or laser cutting. Were I work we have multiple seats of Rhino and I seem to be the only one that has this problem,
Naturally I and others have gone through line by line with the save settings in the DWG/DXF export option box to see if there is a difference and none are found.
The only thing that seems to be different in all cases is that my seat started out as Rhino 4 and has been updated to Rhino 5, The others seats in my group started out as Rhino 5. This also means I have the most experience with Rhino as well.