Google pdfs (and downloads from Google books, a great many rare books there) work fine on the DR, although a they're a little slow and benefit from optimization. IA pdfs also seem to work for me, if you linked to a troublesome pdf, I could take a look.
If a "pdf print" throws out a pdf much larger than the original, its possible that your printer is printing the pdf as a bunch of no-nonsense images, which is why it loads on the DR, albiet slowly.
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