VR Content Example doesn't work on OSX

OSX 10.10.1
MBP 2014 15 inch, NVIDIA GeForce GT 750M
DK2, OVR SDK 0.5.0.1

Other apps work with the rift, but nothing in UE4 does. Confirmed in the VR content example, the HMD screen goes black when played in VR mode. Sometimes it crashes.

I am having the same problem, though it seems to hangup every time after the DK2 screen goes black. Same project works fine on the PC. My mac: 2013 Mac Trashcan 10.10.3 UE4 4.7.5