I have been seeing dynamic shadow artifacts on 4.16.0 and 4.16.1 using the packaged engine as well as built from source. To recreate, I have created a new level, added a directional light and a cube, set the cube to movable, and rotate the objects to create a self shadow on the cube. The issue is only present when the engine scalability settings are set to High, Epic, or Cinematic, but go away when set to Low or Medium. I have recreated this issue on separate machines with windows 7 and windows 10. Both machines have Nvidia Quadro hardware from different generations. I have updated to the latest Nvidia drivers. Has this issue been seen elsewhere? I have not found any bug submissions related at this point. Let me know if I can clarify anything.