I have a 310XT and am unable to sync anything other than activity data to my device. I have deleted the device, upgraded the software, rebooted my PC, and reinstalled the device (twice). It recognizes my device and syncs all activity data, but no other data. I'm trying to send a route to my device from Garmin Connect. I've also tried to send profile settings and workouts, but those won't sync either. Only run/workout activities will sync. I see a lot of people have had trouble with sync issues, but none of the solutions posted have worked.
I've been trying to do this for weeks and have done the delete-reinstall more times than I can count! Even with the newest software update, it's still not working.