Funny you should bring that up. I just got a new head(SL wired) for an old set of training wheels(yellow PT pro) and took my first ride with them. All seemed well during the ride but I had trouble downloading with the new USB cradle(first time). I finally got it to downloaded, but only 4 mins out of a 3:37 ride. When I took it out of the cradle all data was set to zero(including odometer) and the date was set to 27/05/05. I reinput the corrected data and went on a ride today and everything downloaded fine, including all of yesterdays ride. I don't know about your situation, but I think mine had to do with the inaugural download with the USB cradle vs. the old keyspan serial download.