I have had this problem for quite some time. It has happened on my last three computers. I have asked about this before, but never was able to get a fix for the problem, so I figured I'd try again.
The computer I am using now, is only a few months old. My previous one crashed, so I had to re-install from the website. It doesn't happen all the time, but it is annoying. Sometimes when I control-right click to assign a material or change one, when I use O2C or Sunshader, the existing materials change. Over the years, I found the fastest way to correct it is to control-right click again, select materials by entity, and then cancel. This corrects all the material assignments. It seems that I'm the only one it happens to, so it must be something in my setup. Any ideas?
The computer I am using now, is only a few months old. My previous one crashed, so I had to re-install from the website. It doesn't happen all the time, but it is annoying. Sometimes when I control-right click to assign a material or change one, when I use O2C or Sunshader, the existing materials change. Over the years, I found the fastest way to correct it is to control-right click again, select materials by entity, and then cancel. This corrects all the material assignments. It seems that I'm the only one it happens to, so it must be something in my setup. Any ideas?