Below is a link to a file that shows a sample of my problem. Basically, when I convert CAD drawings to pdf using Acrobat 7 Pro, then subsequently open the pdf and zoom in, you can see horizontal streaks of white, usually in the areas where I have closed polylines with solid fills. I have tried every CAD printing option I know of and every Acrobat conversion setting to troubleshoot this problem to no avail. I have even tried 3rd party products like acroplot with the same effect. For every day pdf creation, its no big deal, but when I need something to be perfect for print, its not exactly what I want. The sample shows a very minor version of the problem. Usually the streaks are more prominent. Has anyone encountered this before, or can offer a possible solution.