Just thought I'd throw this out, as it makes me a bit upset.
In Arctic Mission, I had ground that was more white so it looked like snow.
In the new version of CC, you have to specify the material's texture in the material itself, so I did.
Then I had to edit the map contour so that it had the new materials, but there were no colours there to support them. So, I just changed the palette and added in new materials.
It worked perfectly fine...
But...
Now, using that particular contour, terrain frosting and randomly placed objects don't show up.