Leap Motion stops tracking after exporting some meshes into VR preset scene

There is an issue, when starting a new VR preset scene. I setup Leap Motion into scene using LM Quick setup guide ( Ultraleap Plugin for Unreal — Ultraleap for Developers )
After this manipulations Oculus + Leap Motion works well, so LM is tracking hands.

But after I export some meshes and build lighting to scene, I tap play and I can’t see LM hands tracking, when I move hands in front of LM, sometimes it looks like there are some freezes (fps lowering), like should track hands or they are traking but i can’t see them, like they are invisible or out of sight range.

May be some one faced same problem