I'm having trouble printing transparencies created in an exported pdf from indesign. They print fine direct from indesign, and look fine in the on screen view of the pdf. But when I print the pdf. They show up as a block of colour. I've tried exporting as eps files to see if they flatten ok and whether there is a problem in the way I've set up my document in indesign but the eps files are fine. Is there something I need to do in the pdf as opposed to indesign?