Hi Ralf (and others).
I have been trying to get vorpx to work with my dk2 but no luck. It has installed correctly and the dk2 is detected fine on my computer. I have set it up exactly as you have described including the 8.1 sticky. I have also been through the troubleshooting. Reinstalled many times. Games act as if vorpx does not exist at all. It does not hook up to them at all.
Below is a image of my processes running. Note, I have tried with steam origin and firewall turned off. I have tried with multiple games but just no luck. Fraps is only open now to take screenshots of task manager.
I’ve had similar while running Live for Speed AND vorpX at the same time and they both make the view Oculus compatible, so it is “double Oculusified”. Try it without vorpX and see if it’s showing on the Oculus.