I' sorry that I did not mention that I have the DEM files installed. Still, when creating a track manually, and then going into statistics, no altitude statistics are shown, and no graphic.
It seems that when I look at the "propriétés" (I have the frech version) the track and do an altitude correction using DEM, I get no statistics. I need to reclose the "propriétés" of the track again and reopen them, and then I get atitude gain and loss, but no min altitude and max altitude ?
Any idea what's going on here ?