Here is the problem: When I print preview my drawing with a black background, only the yellow colored lines show up; when I preview with a white background, everything EXCEPT the yellow lines show up. When I actually print, though, everything turns out fine. In our office, each color has a specific lineweight, so I changed a couple of the yellow lines to a different color but maintained the yellow lineweight, and they showed up in the previews, so I know that it is not the lineweight that is the problem. Anybody run into the same problem or have some insight?