Interminable "loading" after saving new course

Hi. I have a shiny new Edge 810 and am trying to experiment with courses. I've created a course in Garmin Connect, named it and clicked on the save button. It then just shows a map with no outline of the route and the word "loading..." with a circle to the left going round and round. It has been doing this for 10 minutes without anything changing. Is this a known issue or am I doing something wrong? The course is a simple 60km loop, starting and ending from the same point. I've tried the whole thing twice but without success. Any advice would be very much appreciated. Thank you.