Ok, I have been able to reproduce the issue and the way to fix it is always having “Multiplayer” set to “ON” in the General Options/Data and then in the Flight Conditions manually set Multiplayer to “Off” or “All Players”. Hope it will work for you. But yes, I agree that there is a logic issue if “Multiplayer” is set to “OFF” in the General Options/Data, Preset/Custom options should not be greyed out.
