ensure settings > tap on track: popup, not screen
tap on track > track info > tap on greater than > menu popup > tap on Show on elevation chart > 1st tab of track info is displayed and chart tab should then be selected/ chart displayed, but isn't.
(https://s18.postimg.org/bhnllbutx/2017-11-21_14_40_04-.png) (https://postimg.org/image/bhnllbutx/)
Good point, thanks Andrew, fixed.