Hi John,
So we tried the Show Grid Lines check box and it really didn't solve the problem. The background is no longer white, as you said, it's now alternating very light blue and white rectangles. Unfortunately, the contrast between the light blue rectangles and the white of the lines and symbols is almost imperceptible. It seems like our only solution at the moment is for each element plotted we double click on the graph, choose the "Style" tab in the pop up box, select the offending wavescan and change the color. However, this selection doesn't stick from element to element and has to be repeated every time. It's not the end of the world! I was just checking to see if there was something I was missing or a default I could change to make white not be a defined color.
Thanks!