It's a bit hard to describe the problem I'm having, but basically all of the PDFs that I open these days display weirdly. First, the fonts (all standard) appear oddly pixalized, rather than smooth. Second, once I've clicked the PDF link and the document has appeared in a separate window, the original website page appears completely black.
I think I've downloaded all of the updates. I'm running Windows 7 (32-bit), Office 2010, CS5. Everything prints just fine, so it's a display issue.