So you're saying the hatch displays correctly on the screen, but then does not get reproduced in the PDF?
If you print straight to paper does it work?
Have you checked your Save As PDF options (button in the 'Save As' dialog)? I generally keep my PDF dpi at 300, and make sure all the High quality lines & shaded edges etc are selected.
Yes, it displays correctly on screen but when I save as pdf I get the transparency.
When I print directly to paper it is also correct (with a solid hatch and none of the lines showing under the hatch).
I have adjusted the settings, with all options selected and tried 300 and 600 dpi and I get the same result.
Thanks for the suggestions!