Project crashes when open it on Oculus DK2

Hello everybody,

Since two days I cant open my project on the Oculus Rift DK2.

So I tried to exported it in different Modes: Development and Shipping, 32- and 64-bit.
DIfferent Versions (UE 4.9, UE 4.10)…
Everytime i can open the standalone Version and it works perfectly fine.
But when I hit alt+enter while the oculus is plugged in, it crashes and Windows 7 says: “AppHangB1”.
And I just can shut down the program via the TaskManager.

I already tried different NVIDIA Drivers in combination with different Runtime drivers from Oculus. Nothing fixed it.
I tried to clock down the graphic card (Nvidia Geforce GTX 970), doesnt fixed it either.
I just generates different standard projects with the Unreal Engine and all of them are working with the Oculus.
So there must be a configuration failure in my Project.
The strange thing is: Two times i get my project working on the oculus without changing anything! The next time I tried to open the same standalone version, it crashes again.

So my question is: Does anybody has a simulare incidence? Or are there some setting within the Editor where I should care about when using the Oculus?

Thank you for helping!

Best regards.