Thanks! Nice, works with my okular 1.9.3 too, after asking whether it should show forms. The PDF-X I have on windows asks also (I think they use the same engine

Thanks! Nice, works with my okular 1.9.3 too, after asking whether it should show forms. The PDF-X I have on windows asks also (I think they use the same engine, poppler?), but then shows a blue rectangle if I enable them. I'm pretty sure that was what my experience was generally when I looked at it the last time (2 years ago), so probably some updates in the engine which made it work now.