Turn off grid / shading on printed schematics

[euzer]

When I print a schematic (AD20) a fine dot grid (or shading) is applied, even if I turn the grid off under preferences in the schematic. The schematic itself was set to line grid (if I use it), so not sure if the dots I see on a print off are some light shading. How do I turn this off?

Thanks

Edit: Fixed - the RGB values weren't all 255 under properties->General->Sheet colour

My current problem is getting net junctions to print as filled solid when I select black and white printing - they're shown as just a outline. If I select colour or grey then the junction is filled but the wires are shown in a dithered non-straight style.