OVR Camera falls to terrain (after compiling)

Hey!

I have a problem with the ovr camera by using a rollercoaster.
I placed the camerarig and the controller in the wagon.
In unity preview game camera all works but after compiling the rollercoaster to an .exe, the camera falls every time to the terrain but it follows the direction of the rail.
I hope someone have an idea why this happens.

Thanks in advance!