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Fine grid appearing on images when exporting to PDF/X3

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I just noticed a weird behavior when exporting to PDF/X3: a fine grid is appearing on all images. And this is happening on one user account but not the other on the exact same computer, same afpub file. I tried to delete all user preferences, restart Publisher and export again: same result. 

Has anybody already seen this? Any idea what setting could cause this?

Capture d’écran 2020-08-29 à 7.30.36 PM.jpg

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Possibly those white lines aren't related to Affinity at all but to the way a flattened PDF is structured and displayed. If this is the case then these lines disappear when zooming in (don't increase when zooming) and don't get printed. If you don't see them in another user account you possibly don't display the PDF with the same conditions, for instance with a different PDF viewer app or different display setting for thin lines?

Here just two samples of various former reports:



macOS 10.14.6, MacBookPro Retina 15" + Eizo 27"

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