Black computer screen in VR game preview connected to LeapMotion when creating hands for LeapMotion

Today, I just got a new issue while working with Vive and LeapMotion in UE4 (v. 4.13). The computer screen of VR preview becomes black when the game is played as in the picture. I also tried with other files and the issue happens. I’m not sure if it is a bug of version 4.13 or my program. Has anyone had experience on this issue and knwn how to fix it?