I've made a nice flyer in Pages to promote my work, and used "export to PDF" ('best' quality) to make a file for printing. I took this to my local Pront-A-Print and discovered some funny artefacts that were only there on the print, not on screen. Specifically, every element that in pages had an invisible box around it (e.g. pictures, text boxes) now sits in a slightly lighter box-shaped patch on the printed page. The print man said this was a problem with the way the PDF was rendered - it had not been 'flattened' properly and the different layers were showing through. The problem was not visible in Preview or on the print shop PC's Acrobat - only when printed. It was obviously not a physical printer problem. But is it really my problem making the PDF or their problem processing it? How can I get round the problem, given that I can't see it until it is printed?