Installed freeware “Push back helper” and it worked okay. deleted it again later when I found and installed “PACX” instead. When that “PACX” did not work properly i deleted it and turned back to “Push back helper” addon, but now suddenly the ingame sounds disappears when pressing the buttons on its control-panel when using it in the sim. until I tap an area outside the addon panel. Is it possible that the third party addons may have tampered with something that is causing the error? I OR is there a place i can fix it myself. HELP needed 
THX guys