This one caught us out a few days ago. If you have an image with a zero size line width but set with a white colour line on top on a darker larger background, you see (correctly) no line around the image.
Yep this caught me out last issue of our newsletter. In Windows Adobe I had a light gray line around one text box which contained the Newsletter name, specifically created with no line, color none, tried zero width and white, no colour in text box, tried everything None of which got rid of the box outline. It does not appear in xpdf or kpdf in linux. Only appears on my recipient's xp computer using adobe. Ive got no explanation for this one. Roger
