This post will not answer your question. However, I do want you to know you are not alone with oddball plotting problems. I have had so many different little things not work properly that I now will only create Gerbers and them plot them. My favorite failure is turning on the primary side etch, looks right in preview, prints properly. Then I turn off the primary side etch, turn on the silksceen layers, looks right in plot preview, the actual plot scales incorrectly and cuts off a lot of the silkscreen to the right. CAM350 is so worth the money for what I do.