I have a scene that makes max crash while in interactive rendering working.
I have a mesh with a shell object, if I activate the checker to change the material ID of the border max hangs out forever, 0% at CPU.
I tried to reproduce it in a standard scene with a cube but in that simple scene it works, so I think you will need my scene to catch the problem.
What was the link to privately send scenes? (it's from a current project)
Cheers!