Just find a small bug when cancelling change material which affect subsurface.
Here is two cubes,one with green material on a subface.
Modify the color of GREEN to yellow affect the subface.
Cancel this action let the subface yellow.
Simple to reproduce
What Rhino version do you have? I believe this is fixed in the latest Rhino 6 Service Release.
6.12.19023 i’ll give a try to the new one
No… i’ve just update to Rhino 6 SR12 2019-1-29 and it stillo working… give a try.
If you modify the color definition everything update normally, but if you cancel it with the the subsurface won’t update.
Thank you @BEMAD - I can reproduce the bug when using Undo.
I made a YouTrack item: https://mcneel.myjetbrains.com/youtrack/issue/RH-50584.