I’m trying to make a simple flying game in VR using world composition. Shortly after I cross the boundaries of a level, the HMD stops tracking the VR pawn (is this perhaps a problem with world origin rebasing?). Also when I approach the boundaries of a level the HMD quits the game for a moment while the other level is loading. I’m on UE 4.14 with HTC Vive.
Could you upload a link with the screen capture?
You can find the video here: UE4 world composition bug - YouTube
For the sake of explanation: there is a platform underneath the player on which they “fly on”, sort of like a magic carpet 
The platfrom moves in the direction that the motion controller is pointing. Also the levels are not tiled properly, but that makes it all the easier to see the boundary. The HMD stops tracking the VR pawn at 0:57