Hi,
We need to make a few things clear from the video.
If any of the points is wrong, let me know:
First (left) video (the second/right video with Rec709 rendering space is a different thing, so let's leave it for now):
1. The scene is started with Gamma workflow - the render is expected
2. OCIO with ACEScg rendering space is selected - the render is changed and
IS EXPECTED. This is because in OCIO mode Corona VFB does not support view transform - the result is always linear (darker, contrasty). Yet in Gamma workflow simple Gamma transformation is applied. This is mentioned in the
Color Management article as well. So everything is fine here, the color change is expected.
The unexpected/weird thing with the other color change - specifically for the saturated highlights - is what needs to be investigated further.
I can confirm reproducing it solidly, and it is related to the "Reset" action in 3ds Max.
1. Reset max
2. Open the scene
3. Render - result A
4. DO NOT Reset max, re-open the scene
5. Render - result B; result B is different than result A, even though it is the same file, without changes.
6. If the scene is opened WITH Reset first, it will give the same result A, every time.
This will be reported surely. It may be 3ds Max resetting/changing some settings, and/or Corona not seeing them.
Hope this clears things out.
(Internal ID=1284057372)