RIG MANAGER NOT SYNCHING UNDER WINDOWS 10.
If you are having a synching problem when running Windows 10, you might need to update the USB driver.
Start > Right Click > Device Manager > Other Devices > Select Rig Manager > Right Click > Update Driver.
Updating the driver fixed my problem with Rig Manager 3v0_136 (Windows 64-bit) not recognising my laptop just after a Windows update. The driver had a '?' next to it, so I'm not sure if it was something like Windows Security and access rights stopping the driver being updated.