Double click on MyComputers no longer works on one computer to connect.

I have three machines on my LAN running TeamViewer. On two of them I can double click on a remote machine to connect with no problem. On one of the machines, I can only right click and select "Remote Control (prompt for confirmation) to connect. I then have to go to the remote machine to accept ( a pain to say the least). A double click on that machine does nothing to connect either of the other two machines. This started recently with one of the latest TeamViewer updates (not sure which one). I'm running V 15.59.3. I have compared the "Options" setting between all three computers and can find no differences. The only difference I can see is the misbehaving machine has one extra digit in its remote ID. I can connect to the misbehaving machine with a double click from either of the other machines, but not from the misbehaving machine to the other two computers. I'm stumped.