5a693e87_Plus__known_issues____RealVNC___Workaround
[ID] 64 [Description] Turning on the VNC Viewer Plus Relative Pointer Motion shortcut menu option may disable the mouse for connections to Intel AMT 6.0 and 6.1. [Status] Won't fix. [Workaround] 
Do not turn this option on.
VNC® Viewer Plus (known issues) - RealVNC®
Workaround