Jürgen,
I make my own PDF’s, and never have problems opening them, even big ones, with lots of graphics.
I’m wondering if your PDFs use embedded fonts; I always do (I use 14 point Times, as a favor for my old eyes), and I think the DR might be getting confused by font substitution. I don’t know, but it might be worth a try.
Good luck,
Kent Walters
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