Well Mark you are not alone as i use EMC2, Qcad along with DXFtoGode as well as GCNCCam. At some point i will purchase the Vectric products (as soon as i can sell my lathe). Cut 3d and VcarvePro works great under Wine. As for the double line business it does happen with redrawing lines. A good tip is to just resize rather than delete and redraw. Also try saving as the 'R12' version of DXF, I've found no problems there. The Cam packages i use are limiting but because they are not fancy have no issues with ovals. I booted my machine up in Windows a few days ago for the first time in two years to try the vectric software out, after wasting three hours waiting for the updates and virus scans it crapped out with a virus. Booted straight back to Ubuntu loaded wine and hey presto my trial versions worked great with no viruses. If you want to try another freebie then give windows cad progs a try, everything I've tried works under wine.