I have an Edge 810 and Forerunner 110 assigned to my GC account using Garmin Express. When I added my Dakota 20, the iOS app (which was updated on the app store today) shows a duplicated entry of my Edge 810 in the Devices page and then crashes. It does this all the time.
I have removed the Dakota 20 and then the app works. Adding it back to GC causes the crashes to return.