Here is another random error. Went out for a ride, normally leave the Edge on my map screen, "Screen 2". Switched to my "Screen 1" with all my data set on 10 fields. The distance field had been replaced with Total Ascent. Not switched over, as I now had 2 Total Ascent fields. How on earth can this happen. I had not done a software update for a while and had certainly not accidently selected the right combination of presses or buttons to change it myself. Another one to file in the "how on earth does this thing work most of the time if random stuff like this happens?!"