Scene Light not working on MAC!

Hello, we're building a level including a 3D scene and a few characters. We use the environment lighting on both baked objects (static) and characters. It works well on PC and Android devices, but not on MAC.
When we run the build on MAC and adjust the color in real time, only characters are affected, the scene is still dark. We tried almost all options on the Lighting configuration panel, and changed graphics API to OpenGL 3.0 and Metal, and it doesn't help. As we remember, it may have worked in our early builds, we can't remember.

We'll try it again on another MAC, but we doubt that will help.
Would anyone please share some clue about this? We're really in a hurry in solving this.

Thanks a lot!