White artifacts appear when you have a stationary directional light in your scene with default settings that is casting a shadow, and a skeletal mesh is in that shadow after baking lighting.

You will see the artifacts on the skeletal mesh.

Steps to Reproduce
  1. Open attached project on a mac (see environment)
  2. Fly closely around the mesh around the backside

White/grey flickering artifacts appear on the back of the mesh

No flickering

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Cannot Reproduce
Affects Versions4.13.1
CreatedOct 26, 2016
ResolvedJan 23, 2017
UpdatedApr 27, 2018