VR in 4.19 doesn't work

Hi,
i’m using 4.19 version of unreal engine, and i’m making some tests for VR.
I have an HTC VIVE working fine with 4.17.
In 4.19, with the VR Template, the VR is locked and i can’t open my scene with my headset…

I have tried out with the same VR Template in 4.17 version and i have no problems, all works fine.
Any tips?
Thanks a lot

I also tried to restart the headset but it did not work…