Light coordinates: Mac OS != Windows ?

I noted that my projects with 3D shapes, made on Windows, look completely different on my Mac (Macbook pro 13 2016 running Sierra) : the lights coordinates are inverted (I mean something like 5,5,0 —> -5,-5, 0).
This happens only with the lights, and not for points/shapes coordinates.
I am beginner…did I miss something important?

Seems like a bug. Can you post a sample .toe file?

You can easily test it with a very basic network:

Basic3d.toe (5.49 KB)

On my Mac the sign of the light coordinates is inverted (that is: in order to have a light from the left you have to put a light on the right).
I am using 64 buld 2017.15400 on Mac OS 10.12.6.

In your example file, your camera is at +5 in z, your object is 0, and your light is -10 in z, behind the object, and the render is black, which is what I’d expect. If I move the light to +10 in z, the object renders correctly. I’m on macOS. Light and Geometry COMP coordinates appear to be consistent with each other. x & y are also as expected.

Are you saying that the file you submit is NOT rendering black on your computer?