I recently created plot files for a 55 drawing set. I noticed in some of the drawings some of the viewports plotted in color instead of the intended black and white. To correct the problem I had to go into the drawing and copy the properties of one of the viewports that plotted correctly to the color-plotting viewport. The properties of all the viewports appeared to be the same before I did the properties copy so I have no idea what went wrong the first time. Any ideas?