Hi,
I have the problem that I cannot refuel, rearm or even talk to ground crew or Controller of a FARP in a mulitplayer mission, when I am the host. I built a mission, which should be like a team match. Each team has to protect and clear the way for his own convoy along one road down a valley. Due to the length of the valley, I built a FARP at one checkpoint - one FARP for every team. When the checkpoint is freed, supply units spawn at the FARPs, making takeoff or refuelling etc possible. The Kamovs placed at the FARPS have 0% Fuel, so cant be used as long as the FARP is not freed.
Now many tests showed that every client can refuel and rearm and talk to the controller at these FARPs, only me, the host, gets no answer, what ever I do, whatever team I am, whatever FARP I try. I would say, this is one of the many bugs in multiplayer gaming. ;)