I have edited an existing course and tried to Send to Device. Garmin Express appears to work well and a "New File" entry dutifully appears. After an 810 restart the "old" version of the course remains unchanged on my device.
If I delete the course on the 810 and send again, the "old" version of the course magically reappears - spooky.
If I change the course name it also transfers but with the "old" course route.
Thoughts anyone please?