When I connect my Nuvi57LM to Basecamp on my Mac I get a message saying there is a communication problem. I have deleted the .gpx file and all was well until the next usage when the .gpx file created was corrupt. I found temp.gpx in my .gpx folder and clicking on that opens Basecamp with no error. Renaming temp.gpx to current.gpx did not fix the issue not did copying the .gpx folder from my GPSMap76s into my Nuvi. It is a nuisance having to enter waypoints into my Nuvi and Basecamp separately. I never had this problem with my GPSMap units. Can anyone offer any help to stop my unit or Basecamp corrupting the current.gpx file?