I too had the latest drivers for Leap Motion. And it didn’t work. For a long time, I couldn’t make it work. The problem is that Reallusion hasn’t updated its software for quite a while and the latest drivers from Ultraleap don’t work.
You have to revert to older drivers to make it work. For me, the V3 drivers were the solution.
V3: https://developer.leapmotion.com/releases/leap-motion-orion-321-39frn-3b659
V4: https://developer.leapmotion.com/releases/leap-motion-orion-410-99fe5-crpgl