Oculus rift screens freezing when loading a new level

Hi guys, I'm using an Oculus DK2 on Mac, using Unity 4.6.8. Now the problem is when I change levels, using LoadLevel, the level loads as normal in the Editor and the game and scene tabs update as normal, however the oculus screens freeze and keep displaying the last frame of the previous scene until I stop play mode. Have tried googling and nobody has talked about this, hopefully there is something very simple I am over looking if anybody can shed some light with would be much appreciated. Cheers