easy rendering for Rhino in Windows
I encountered another problem today. I have several colorways of a simple pattern that need to be applied. Usually, I get one set (size, properties), then duplicate and just change the texture map. For some reason, it will duplicate a different material than what I selected. I have to restart rhino to get it to allow me to change it. After the restart I can duplicate one and change the map. It previews incorrectly though. I went in and changed the map again, and it switched the preview of a completely different duplicate. Please see the jpg for further explanation. You can see the material that I chose to edit is not the same one that came up.
Have you tried the most recent build. We have added some tools to fix this problem. Are you in Rhino 4 or Rhino 5?