I faced the same problem. Any help would be greatly appreciated.
I upgraded my project to 4.6.0 today, and any objects that have Render Custom Depth to true turn black. I am using a post processing material to apply a color to specific static meshes.
Here’s what it used to do in 4.5.1:
Here’s what it does now in 4.6.0:
Here is where my material decides whether to apply a specific color to an object if it has Render Custom Depth true or not: