When you click on the line path, a dialog box comes up with the path name, a box for notes, the length of the path, and a link with the words 'Elevation Profile'. You need to click on the link to see the Elevation Profile.
If you've done all that, we need to know which operating system and browser you use. We have successfully been able to view an Elevation Profile with the following systems:
Windows 7
Chrome
Firefox
Explorer
Windows 10
Chrome
Firefox
Edge
OSX
Safari
Chrome
Firefox
Thanks.