Fixes the ATC with no freq showing, which I noticed after your testing yesterday.
No connection could be made because the target machine actively refused it
That'll be the issue!
UDP port 9988 will need to be open for the other users to speak to you.
Else nobody will show on the freq as they can not connect and so will go elsewhere.
If the other person shows on the same freq in the window on the left, then the connection has been made and all is good.
If not then one of you isn't connected, (possible port closed).
Thanks for the bugs by the way, exactly what I was looking for.