Reproduction steps:
1. Open attached project "AnimationTest"
2. Open scene "Demo"
3. Enter play mode
4. Observe both Scene window and Game window
--- You should see that character moves differently in each window
--- Especially noticeable if you look at his glasses

Notes:
--- Sometimes Game windows displays correct animations and sometimes its the Scene window
--- See attached video "SkinnedMeshBug.mov"

Regression introduced in: 5.3.0b1 (a535853f4e7c)