Not my post but a heads-up:
Regarding aircraft substitution:
A pilot joined the session in an aircraft I did not have. The aircraft list showed the aircraft as the default Cessna 172 (blue and white, I believe) and when I clicked on the substitution button I could see the actual aircraft (a payware DC-3). But - until I made the appropriate substitution I could not see any aircraft (not even the default Cessna 172). Is this the way the (temporary) Cessna 172 substitution is intended to work?
Wanted to add that I got a chance to try multiplayer yesterday and it subbed out the 172 for the plane the other guy was flying just fine and I could see and hear it just fine.