I dont know if we are suppose to report bugs on Pre-release builds but i give it a go.
Branch: Source build from GitHub
Build version: Preview (8/25/2014, changelist 2270794 ) and current master branch (2014-08-27)
Detailed description of the issue: Problems with shaders and custom depth, easy way to re-create this issue is to download Tutorial – Creating outline effect around objects | Unreal Engine 4 blog and try to set the RenderCustomDepth to true for a static mesh. Nothing will happen, not even warnings.
*Edit: Seems that the SceneTexture expression isn’t behaving like it used to do.
This issue just started to appear with higher versions than 4.4.1.