I loaded the modified DXF sample you posted and it appeared to work except that the x and y coordinates were very high numbers, even for metric. The original shape was about 6 inches across, I was getting x-values in the g code around 200 - 300. Is there a way I can check either scaling or the unit of measurement that results from the DXF import?
My machine is set up for inches as was my Illustrator file.
Many thanks in advance