I today realized the Rendering is appearing in a blueish color tint? Seems like if i do batch-rendering the color-tint resets to a blueish tone each time.
Not sure what it caused it - just started to appearing in various scenes it did worked correctly a week before.
Only thing that happend was the occasional Windows Update and installing of a new Wacom Driver.
Corona 3 Hotfix 2 and 3Dsmax 2018 latest update.
it seems there is some glitch in that specific scene - still even when merging it into another scene.
But opening another working scene from a different project some weeks before and rendering it, nothing strange occurs.
I finally figured what caused it - The White Balance setting in Max’ Phsyical Camera were on a different setting, which i usually don’t ever touch. Seems it was accidently set to 3200K instead of 6500K.
Sorry for confusing you.
Another vote for “always use the Corona Camera” 
TomG
yes you might be right - it was confusing me, that the camera post-processing isn’t overriding that “white balancing” in physical camera, maybe i should have turned on Tone-Mapping in camera modifyer.
About corona camera - i kind of stuck to using standard max physical camera to have it interchangeable with Vray - not sure yet, if Vray can handle Corona-Camera or vice-versa.
