I've noticed some diagonal artifacts when viewing a particular file in Okular. You can see them in this image.


In comparison, Evince displays the image without artifacts.


It also displays fine in Foxit (via Wine). I'm happy to upload the original PDF somewhere (any suggestions where?). I created the image myself. I imported a raster image into Inkscape, rotated it slightly, then exported as PDF. If I don't rotate it in Inkscape, there are no artifacts in Okular.

I'm using Arch Linux and the latest okular 17.12.2.