I just did a ride where I rode to a course then started the course on the 510. Then when I returned to the point at which I joined and started the course I turned off the course on the 510, and finished the ride to where I started. This turned out to be quite a long ride with lots of climbing so I really want to see what I accomplished. Trouble is it is not loading on the 510 (gets stuck loading) and when I try to sync to Garmin Express it says it synced but nothing is there. Also, when I loaded it to Strava the ride started and ended where I followed the course, not the full ride.
I'll assume that something is wrong with the file. What do I look for and how do I fix it?