Hi
12/04/18 Sorry, I’ve been away and unable to respond! Further to my post and to Nabeel’s reply. My X-theme is updated automatically. As far as I know X is 6.0.4 and Cornerstone is 3.0.3 and the triangle menu is still not functioning.
The triangle at the far right top of screen (See Screen shot) that should access Archives, Categories etc as at the bottom of my page when clicked doesn’t open the menu. I think I have had this problem before but can’t remember the fix.