I encountered the issue with the side buttons click on HS611 pen. There is a variable lag between click and cursor movement. Sometimes after a click, the mouse cursor freezes for a second. See the video attached.
The issue is repeatable on different computers working under macOS Catalina.
Driver version 200417
Hi Mirrorart, if this issue does not get resolved when using the Driver_184.108.40.206106 version, which is the resolution I've provided to your other concern, we will have to check your pen's performance using our software. Do you have access to a Windows computer? Unfortunately, our software can only run on Windows at this time. Please let me know if you do so I can send the software to you.
HUION Customer Support