Screen not updating and other connection issues

I have always used ScreenConnect across some very poor internet connections (like buggy 1Mb/500Kb from 10,000 miles away) and it has been generally reliable with only a few glitches here and there.

However, as of late I have had very bad problems with those connections and also some where both parties have 1Gb internet.

I get blank, black screens at login that do not update unless I send ctrl-alt-dlt and then close and reopen the connection. Even then, sometimes I get no update unless I reboot the guest.

This happens with Win10/7 and Server 2008/12/16/19 guests, and multiple host machines.

Typically, once I am in everything works