Same thing here. I have to right-click on the primary machine MP running icon, choose "unload Multiplicity, confirm, and then restart using the desktop icon.
"I also right-click on the KVM sidebar and close that before restarting).
This >usually< clears it up, but is a PITA, and happens several times a day.
As a workaround, once I get a stable connection, I keep it open by just minimizing the window.
Still, annoying and unacceptable.
You have not received any response on this at all?