Stevo from Live Racers is away till this coming week-end. If you look in your userdata folder, there is a logfile that is created.
Take a look at the log and see if for any reason, there are any errors.
I am sure as soon as he returns, it will be priority one to fix any issues on his end.
Have you tried, starting one instance at a time, and seeing if it appears in the MM Lobby?
If it appears and remains after re-freshing a few times, start another and try to see if it is just a port issue?
When I set up a multi server set up, I split each server by 300 each, also the HTTP Server port.
example:
Server 1: Open-Wheel
Simulation Port="49297"
HTTP Server Port="50297"
Server 2: Historics
Simulation Port="49597"
HTTP Server Port="50597"
Server 3: GT
Simulation Port="49897"
HTTP Server Port="50897"
And so on
I just create a server-port.txt on the desktop and paste each into it for easy reminder.
Dave
NRT