Just a quick reply, I circumvented this by stopping Driver4VR, running the SteamVR room setup again, and the re-enabling Driver4VR once done. I believe that SteamVR has a difficult time choosing which of the 5 outputs (left hand controller, right hand controller, hip sensor from kinect & feet from kinect) to be the actual controllers. The SteamVR room set-up will choose and 2 at random it seems, but as long as Driver4VR is not running during the set-up, it will choose the controllers as it should.