Can someone post some kind of tip or hint please? I'm still a bit confused about this problem...
Thanks in advance.
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The only reason I can come up with is that there is a non-printing layer in the original file that Acrobat respects, but Photoshop does not because it is flattening the image.
But if there is a layer in the PDF, I would assume you should notice when you preflight the PDF against PDF/X-1a for example (in which the use of layers is not allowed). But it does not.