You are lucky … for me the Tracking is completely stuck.
Something else the player (or camera view) is like 1 meter -Z offset.
And the Instanced Stereo Rendering has a strange behaviour, particles spawned in planes shapes and some materiales are not rendering
Unreal 4.11 Preview 2 + DK2 Runtime 0.8 + Windows 10 64Bits + GTX 980Ti (Drivers 361.43)