I am having issues with the elevation graph being shown on courses greater that 100km in length. The graph works fine during the course creation but doesn't appear again if I click on the course details at a later time. 100km appears to be the limit to this as all courses under 100km still work fine.
I also observe that this might only be happening for metric measured courses as I can change browser, paste in the course link and view it anonymously, it shows the course and elevation graph perfectly well in imperial. Subsequently log in and pick up my preference for metric and again the elevation graph disappears.
I'm using both Chrome Version 46.0.2490.86 m and Firefox 38.4 and observe identical behaviour.