I have followed the instructions for setting up Linda and have used it for limted periods of time before it simply stops working. It appears to stop when FSX loses focus e.g. when I accidentally enable EZDOK camera update - 2 on the NumPad. Very frustrating.

Try to put the lineKeyboardFocus=yesinto the [buttons] section in your fsuipc.ini fileThis will tell FSUIPC to send button stuff to FSX even when FSX does not have focus.