I recently installed CS4 (previously had CS). When I try to create a pdf file using Acrobat 7.0 Professional using jpgs that I have created with CS4, I get a blank white screen with no image. If I use a jpg that I had created with CS, it works fine. If I take an image that I made in CS and save it with a different name using CS4, it doesn't work. Why? Is there some setting I need to change so that the jpg (or other file types) I create with CS4 will be recognized with Acrobat 7.0?