White Lines Across Powerpoint files converted to PDF

I have a number of PDF files that were created from Microsoft Powerpoint presentations on a Windows PC. The Preview inspector says they were created with Acrobat Distiller 8.2.2. Until recently, these PDFs looked 100% correct when viewed in Preview or Safari. Now, though, they have horizontal white lines across the pages. There are 6 white lines on each page, evenly spaced, each about 1 pixel in height. They stay at 1 pixel in height even when I zoom in/out on the document. At some zoom levels (100% being one of them), the area above and below some lines will become misaligned. When viewed with Adobe Reader 9, the lines are not there but the misalignment is (though it is not exactly the same as in Preview). Unfortunately, I can't say when this started happening other than it was fine in September (2010) and isn't this afternoon (Nov 22, 2010). It happens on a coworker's Macbook Pro as well as my iMac so it is not something unique to my Mac.
Anyone else seeing this? Any ideas as to how to fix it?

Hi, I am having this problem also on my iMac. Some of the images have the lines and some of them don't. When the PDFs are printed, the lines don't show. My problem is that these PDFs will be linked to on a website for the clients to print, and they will seem them with the lines. They are pretty unsightly, and my boss has put this into my lap to figure out, since I am the designer. Did you ever find an answer for this? I don't know where else to turn, since this company is insisting on using Pages, rather than something like InDesign.

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