Hi gumball
though new to this forum, I've suffered chronic CNC for some years
FWIW, I've just imported your DXF into VCP (4.6) and it ran flawlessly, both as a Vcarve and relief, no open vectors
if you're interested, give me a shout and I'll send you the gcode (not yet up to speed on posting files in this forum)
Regards, Lin