I've looked back at the posts above, and realised something. All I saw was the white squares in the recent screenshots, and I hadn't seen the first post, so I thought it needed the mane code, but I was getting the problem all wrong, sorry about that.
I think I have a possible solution for what the main post may be describing, and it's not another code, but first I should fix what I got wrong. If there are two codes for "maneMat2" in the same Material file, delete the one I gave you. Let me know if it shows up or not.