Same problem here, but worst.
I tested lines width from 0.13mm to 0.25mm and print it on paper.
The sheet present only 2 lines width, one more small <= 0.10mm; others with the same big width >=0.25mm.
Tested with a Samsung Laser and an HP Deskjet, same result.
V.220.127.116.11 and V18.104.22.168 are working fine on Kubuntu 8.04
May I send you a DXF with my test?