I suppose that, when the 'remember current page' box is on, the reader does not only 'touch' the file info, but recompresses the file and saves it again. So, even the size may be different, or I suffer hallucinations. When I initiated this thread, I didn't dare to tell it, but I thought that I had noticed it too (for files previously compressed with a slightly different zip algorithm or parameters?).
But as for me, I got a satisfying answer to my question: as far as the box is unchecked, the behavior of the reader fits my needs. Maybe the box should be unchecked by default.
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