I use UltraVNC since it's early beginnings and had only smaller and temporarly problems. Now I have updated my PC scenery with the v1.3.8.1. But with this version a connection from a client to a server suddenly changes from readwrite mode to readonly. And there is no solution to this situation than to reboot the server PC

This problems happens on different server PCs.
System-Info: Client- and Server-PC are Windows 10 (lastest Updates), running in the same Network.