Black screen in DK2 when running Unity builds

Hello,

I am learning Unity and following a simple tutorial that creates a plane, a cube, and a light in Unity. I know the basics of 3DS Max, but am new to Unity.

https://www.youtube.com/watch?v=xU5_1ivyItg

When I build the project and run its "DirectToRift" exe, The DK2 screens are black, even though the blue light turns on. I also do not see the health and safety warning which should default on a Unity build for Oculus Rift. The on-monitor window is also black (after showing the Unity logo)

I have made sure that:
The Oculus Unity Integration assets are all imported
The OVRPlayerController is above the plane and the light is above the plane illuminating the scene
The only camera in the scene is the OVRPlayerController
Oculus Rift DK2 is in direct mode

If I get rid of the Oculus Unity Integration assets and just use a general "Character Controller" and build my project, everything works fine and I can navigate around my scene (on the monitor only, of course), so I know my project can build fine - it's just the Oculus integration that seems to be causing the issue.

I'm using SDK 0.4.4 and Unity 4.6.2f1. GTX 970. All other demos I've run work fine for me.

Thank you kindly for your help.