Material replacer not working

I see you are on MacOS. Please put this (and the version) in your system profile.

Also “0” is not a valid graphics subsystem. You can find out what to put in your profile from this topic:

[Howto] Where to find Hardware Graphics Info for your SketchUp forum profile (wiki)


Open the Ruby Console, leave it open, then close and restart SketchUp.

Any errors?