I'm not suggesting that FSUIPC makes my joystick start transmitting. What I am suggesting is that if my joystick causes FSUIPC to notify Squawkbox on the other PC that my mic should be open, and it doesn't instruct it to close the mic, then the mic is going to stay open till I shut down and restart Squawkbox. That's what appears to be happening. My last message might not have been totally correct because I'm not sure exactly what the order was that I tried different things. I do know that the way I got it to stop was to delete the FSUIPC config file, restart flight simulator, then restart Squawkbox. Basically just removing the button mapping from the config file and restarting SB afterward. I'll try remapping to a different button, but I've never had any issues with any of the joystick buttons in the past.