I saw the mention of the DK2 in the Beta 5 changelog and hat to update my version to that.

Now when I activate the Oculus Rift with DisplayFusion running, my Desktop turns black with only the mouse left.
Only thing I can do from there is to reset my computer.

From 2 times I tried that it happened 2 times, the first time when I activated the Oculus, and after a reboot, the second time when I turned off the Oculus.

I'll experiment some more to see if I can find a pattern for that behaviour.