Dears, I spent already hours and hours to solve my problem and I have no more ideas what to do. I have FSX, flying PMDG 737NGX connected to VATSIM, using FSINN. I also have ezdock camera and Track IR installed. When I start FSX, connect to VATSIM, everything works. I can transmit, I hear the beep when I click PTT and I hear beep, when I release the PTT also. Mostly when I start to move my plane on the ground, sometimes during taxi, sometines after airborne my PTT stops to work. I just do not hear the beep and ATC does not hear me :-( I tried to restart FSFDT during flight, it did not help. Only restarting FSX helps :-(If you have any idea how to solve my problem I will be happiest man on the world.Thank youPetr

After next 5 hours I found the problem.When I use Track IR (version 5) and I want to extend flaps (F7) just one click does not work. When I hold F7 for a longer period (1sec for example) flaps are extended. It was strange to me but I was able to extend the flaps, so I did not care. But exactly in this time PTT button and also numbers from EZDock camera stopped to work. How did I solved it? I use other button to extend the flaps.Petr

Troubleshooting can be difficult but you got the result that you wanted finally. Glad you found what the issue was.