A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
Still getting this issue on Unity 5.4.1f1, we have been dealing with this issue for a long time and would be great to get a fix for it.
Another option is to use MaterialPropertyBlock. It allows you to customize specific material properties without copying the material - and also...