Here's the screenshots of two models with the issue. One of them has Corona physical materials, the other one has glTF material (it was displaying fine with Max physical material, but become inverted upon conversion to glTF with Max's scene converter). Notice how the model with Corona materials (the truck) is actually displaying fine in one of the viewports, while it's inverted in others even though all the viewports share identical settings as far as i can tell.
I can share both models, but i don't want to bother with opening the support ticket. Would it be ok if i do this through skype, George?
edit: i'm using 3ds Max 2023.2.2 and Corona 9 final.