I’m guessing that this happens < 1 in 10 times I render, maybe 1 in 20.
Anyway, I used _viewcapturetofile to save a raytraced image and saw artifacts in the final image.
I haven’t been doing as much rendering as I used to but I recall seeing, and ignoring, these artifacts some months ago. I can fix them by switching back to ghosted or shaded and then going back into raytraced.
I see white, over-saturated looking, “circles” or rounded ended lines.
Look at the picture with yellow highlights around the areas. I will include an undedited picture so you can see them once you know what to look for.
I forgot to mention that once I fix the problem by switching view modes: it stays fixed. (I think)