We are having a similar problem. We use Leap Motion on five machines, and this has started happening on one of them, after leap motion has worked well for over 1 year.
We have tried reinstalling leap drivers and reinstalling windows, with no luck. Leap motion shows up in the Windows 10 settings but doesn't show up in the Leap Motion control panel.
Two of our five machines have exactly the same hardware (both components and peripherals), this started 1 week ago on one but does not affect the other.
We develop for leap motion Orion using Unity, however this issue persists when LeapMotion isn't running.
Windows Settings Recognizes the Device:
AMD Ryzen 1800X
Gigabyte X370 MOBO
Ripjaws V Series 16 GB 3000 MHz RAM
Samsung 960 EVO M.2 NVME
Seagate 2TB HDD
Gigabyte AURA 1080 Ti
EVGA SuperNOVA G2 850W PSU
MS Windows 10 Pro
Leap Motion (Either pass-through USB 3 or connected with original cable)
Logitech 930 USB Webcam
Logitech K120 USB Keyboard/Mouse