Rhino 6 assign material problem

I have been using rhino 6 for a year. It is the first time for me to encounter this problem and have no idea how to solve it. I created a new rhino project and seems can’t assign material to any extrusion.
I have tried to reinstall, but the problem still there.

Can you please paste the unredacted output of the Rhino command _SystemInfo.

It has been solved

Thank you for your help.

Ok, cool that it worked :slight_smile: