Hi,First things first; thanks for a superb add-on, really explodes the immersion level for my PMDG 747.Stumbled to a weird situation. Everything went smoothly all the way until the descent phase, when somewhere during cruise phase my FO suddenly became mute, and didn't recover during the rest of the flight. Direct commands seemed to go through like flaps etc, but no voice coming out from him anymore.Okay, story continues; after landing when exiting the flight to FSX main menu, suddenly the FO springs to life and all the comments that were supposed to happen during the flight, came out as a burst one after another. So seemed that at some point during the flight something blocked the comms from his direction, and the buffer emptied itself when exiting the flight.Anybody experienced anything similar? Could missing some vital step in the command flow cause such behaviour?Cheers,Mika