To reproduce:
1. Open project
2. Go to Player Settings- > Other settings -> Graphics APIs for Windows. Make sure, that there is only Vulkan included
3. Build and run 'DemoWalk' scene.

Expected: scene will run
Actual: scene crashes or freezes after a few mouse clicks in executable window

Reproduced on 5.6.0b7, f3, 2017.1.0b1

Note: Scripts which cause crash are in Camera game object. If any of these 2 scripts are disabled, crash becomes not reproducible.
Everything works properly in editor and DX11 build