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Do you have the reciever set to the same protocol that mapsource uses? Or have mapsource set to use the protocol that the reciever uses? Thats what I had to do to set my garmin unit up, may be the same for your usb mouse, or it could be that the USB mouse doesn't work with mapsource.
I have a Garmin GPS V and use mapsource that came with it. My mapsource software is locked to the GPS V serial number. Garmin required me to register the serial number of the GPS unit, then they sent me a key to unlock the software which will only work with the correct serial number of the GPS unit. I believe Mapsource uses the "GARMIN" communications format.