I've got a 2 spot colour job which prints and PDFs oddly. The image is a duotone blue and I've laid the same image over the top as a duotone orange to give some depth. I'm using Quark 7.1 and have set the bottom image as knockout and the top as overprint. When I try to PDF though, a large chunk of the orange image disappears. The top image is a screenshot in Quark, the bottom as a PDF in Acrobat. It prints out as the PDF. Any ideas?