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Pete installed version 5.102a and everything works fine now. It would be interesting to know what changed since FSUIPC and the A36 get along fine together in P3Dv3.4 Thanks Again for great support Dave

Pete It's using the on screen buttons - just clicking it with a mouse. the only buttons I have programmed on the Logitech Extreme 3D are basic things like flaps, brakes, etc. nothing to do with avionics like radios, autopilot, etc. P3D and FSUIPC5 were a clean install and I had not touched any settings in FSUIPC. My only use for it is so that I can run Flight Sim Commander from laptop through WideFS I disconnected the joystick and went through task manager and shutdown anything else that could be running with P3D and switches still did not work as long as FSUIPC5 is active in P3D. If I set FSUIPC 5 <Disabled> to True in dll.xml and restart P3Dv4 the switches work fine again. I have attached all the files - hope they help additionally, if I set up a key press in FSUIPC5 then the freqs will switch with the key press but will still not work if on screen buttons are clicked with mouse. Dave FSUIPC5 Install.log FSUIPC5.ini FSUIPC5.JoyScan.csv FSUIPC5.log

Let me start by saying this is a clean install of P3Dv4. Installed a registered copy of FSUIPC5, Version 5.102 and can no longer switch the Nav Radio Frequencies in the default Bonanza A36 between standby and active. I can change the frequency numbers in the standby slot but can not make the frequency active. Removed FSUIPC5 and radio functions fine. I have attached the log file Thanks Dave FSUIPC5.log