4.17 Oculus HMD not intializing

I’ve recently updated to 4.17 and my Oculus won’t initialize. The VR preview button is greyed out and I get these errors when I open the project.

LogHMD: Failed initializing OVRPlugin 1.15.0
OSVREntryPointLog: Display: OSVR client context could not connect. Most likely the server isn't running. Treating this as if the HMD is not connected.

I first tried upgrading a project of mine from 4.15 to 4.17 so I went back and tested on both 4.15 and 4.16. The oculus initializes just fine in both previous versions.

OCULUS: Debug: [HMDState] Using default profile default
LogHMD: GearVR: Emulating GearVR using Oculus Rift!
LogHMD: Oculus plugin initialized. Version: 4.15.3-3450819+++UE4+Release-4.15, LibOVR: 1.12.0, SDK: 1.10.0, built May 21 2017, 11:08:57
OCULUS: Debug: [HMDState] Using default profile default