Hi, I have the Leap Motion 4.0 drivers and the control panel indicates connection is good, the device is working.
Motion Live displays the device under 'hand', but the green circle isn't filled. 
Tapping the green circle doesn't connect (produces error).
I've checked Norton Firewall, leap and iCline are 'allowed'. Turning off the firewall doesn't make a difference.

Is there a port issue or something else that might keep iClone from connecting to the Leap Motion device in iClone?

I would love to have an answer to this question too. Any feedback  from users with the Leap Motion plugin working would be Greatly appreciated.

Thank you!

Ryzen R9 5950x, RTX 3090, 128Gb Ram ,2 x 2 TB Samsung 980 Pro M.2 SSD

Horror Stories in VR
Immersive Sound VR
Immersive Sound VR on Oculus TV

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

My latest movie THE GOLDEN MAN, and a few others: https://www.youtube.com/channel/UCIl1EqVCKitZzLqaNnLK0BA