[Zubersoft]

Another user spent a fair amount of time helping gather information about the problem, and in his case, bitmaps were actually being generated with all black pixels. I couldn't figure out why that was happening (it could be some kind of weird error in the PDF library), so I added code to specifically check for this and re-render the bitmap if necessary. So in theory you shouldn't see black pages anymore. Turning forward four pages causes the bitmap to be purged from the cache, which is why that approach works (as it forces the bitmap to be re-rendered when you turn back to the page).

Mike