Hi Tom,
first of all thank you for the great work you have done on this Theme.
Everything is working flawlessly on Desktop and Mobile, but on my clients Windows Phone 8.1, the menu doesn’t work properly. The issue is when tapping on the Menu button the list of pages shows up. But on tapping on the list items the appropriate sites won’t open and the start-page appears again.
Generate Press Version 1.3.40
gp-premium Version 1.2.91
I have the same problem. I am currently running GP Premium Version 1.4.3 and GP 1.4.
This is also reproducible with the (black) main menu on demo.generatepress.com
Menu -> More -> Spacing …
works on my Android, doesn’t work on Windows Phone