Caisson:

YES it changes when you dial levels, dissappears and comes back after rendering again.

YES I experienced exactly what you say, with props and figures.

YES it happens on me when I move things with different materials, some props as I have seen.

Fabi @FKDesign

One in some place under Southern Stars...
Don't tell me that I am wrong if I say I saw pointed ears this morning, in my mirror... they are there.