[Unity 5.3] : [VRDevice] Initialization of device oculus failed

I just installed Unity 5.3 today december 8th, 2015, and I have tried my VR Windows player using Oculus DK2. Without any modification from my previous Unity 5.2 version, I now face the error "[VRDevice] Initialization of device oculus failed" at start time. DK2 indeed not working. I do not use the Oculus Utilities package; just the built-in VR support of Unity.

My configuration (that works OK with Unity 5.2 32 bits) :

• Windows 7 64 bits;
• Unity 5.3 32 bits
• Oculus SDK...

[Unity 5.3] : [VRDevice] Initialization of device oculus failed