Hi,
I have been doing as bit more testing with the Huion talet I have and OpenToonz. I was having some strange results on Windows, so natrally the first thing I looked at was the driver configureation. After reinstalling the the driver everything seemed to work fine with in windows. Tested with opennig programs with just a tap of the pen and within Draw of Libre Office. The probelm comes when I try to use OpenToonz. For some reason a pen tap is registered as a right click and the right click that I have assigned to a button on the pen is the left click. A way I illistare this is with the room buttons. Just tapping on a room button does not move you to that room but brings up the room edit menu. The same goes for selecting a room, I must press a button on the tablet pen that was configured for right click.
I hope I have given enough information for this to be replicated. I have a Huion 610pro, toshiba satalitte, latest windows 10 and Huion driver.
All the best
Dan