Local Multiplayer with Slpit Screen problem

Hi, I´m currently working on a Local Multiplayer Game, were one player uses the Oculus and the other the normal PC Screen.
To achieve this, i´m splitting the game Screen and streching it so that it has two sides for the two different cameras (i´ll post images later), The whole gameis based on of my previous projects, Heidenspaß were the split-up worked just perfectly.

But now i have the Problem that while in Play Mode or after being build&run, the oculus takes over the whole game screen, ignoring the split-up. I suspect that the OVR Manager script forces this behaviour but sadly i´m not script-savvy enough to tell what part exactly. If anyone has any idea how to fix this or any suggestion what causes this problem, that´ll be awesome because right now the multiplayer part is pretty much dead.

many thanks in advance!