I just recently updated my SolidWorks to 2016 because some customers of mine are using it.  I've come across an interesting issue and I have no idea whats causing it. When I'm opening assemblies, random parts are colored red.  I never set this color, I typically used a custom appearance I made, "Black Oxide", which is still attached to the parts.  When I open the parts that are red, their appearance returns to the black oxide, and when I switch back to the assembly, the red goes away.  There's nothing in the feature tree showing the color red.  Does anyone have any idea whats causing this?