Backgrounds of pdfs turning to Black

I'm having an issue when I import pdfs into Aperture the image (a newspaper page pdf) all the white areas turn to black after several seconds.
Any idea of how to get the whites white again?

Yes the white area is transparent,
the strange thing is that the pdf displays correctly for about 10 seconds then converts to black.
When I try to print I get the back version of the pdf.
Is there a preference anywhere to switch the background default on transparent to white?

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Backgrounds of pdfs turning to Black

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