Ok, so I am almost there!
I have my rift, it's working great.
I am now attempting to run my T3D projects on it. I have enabled "unknown sources", and I am running the D3D11/Open VR example project given in this thread.
Without enabling VR, the project works fine, no issues.
When I enable VR (in windowed mode) the headset picks up an app being loaded, switches out of the home screen, but both my desktop view and the HMD view are black.
When I hit escape, I can see a message "are you sure you want to quit?" appearing on the headset and the desktop app.
When I run in fullscreen, I get a crash, something about DirectX not being able to run in full screen.
I am assuming I don't need to run in fullscreen mode? Is there anything obvious that I am missing here?