I found a Hilarious RayTracing-ScreenShot bug:
-When using Path Tracing lighting, in Ray Tracing…
-if you generate a High Res Screen shot @x 2.0 screen shot size multiplier (3840 x 2080),
it renders the bottom half of the image as a solid black!
Does not occur if you have lighting set to “Lit” (Path Tracing off)
I think it has to do with the Screenshot ‘screen-grabbing’ the Path Tracing render before it is actually ready, like it winds up grabbing a moment in time before the image is fully on screen.