X2VNC is having trouble capturing my cursor

X2VNC is having trouble capturing my cursor

I have a Linux box "L" and a Windows laptop "W" side by side. I use x2vnc on L and TightVNC server on W in order to allow one mouse and keyboard (plugged into L) to control both of them. This setup has worked for many years. A one pixel wide window is created on the left edge of L's screen, and mousing into it sends it over to W where it seamlessly appears on the right edge of that screen.