Hello, I have a bit of a weird problem. My viewport inside an object node is absolutely unshaded regardless of which mode I click, including lighting quality. Though it's fine outside a node. Just like 3ds max 2017 flat shading.
But here comes the funny part when I open one of my tutorial files they work just fine. I tried to compare if somewhere in the settings there is a difference, but there ain't.

Do you have a single Ambient Light in the scene?

I don't have any lights in the scene. Default setup and a sphere node.
Edited the link, you should be able to see it now.

Vux, you are awesome. Thanks a lot !