I have been searching around and not totally sure how to approach this issue with the Ubuntu Hotkeys. For example CTRL+ALT+T, my custom Hotkey SUPER+E for nautlius don't work. There are a few others. It worked when I first installed it.
I think there was something about gnome-session-something having to be restarted, but I couldn't run the exact file.
This tutorial will describe you how to upgrade gnome 3.12 to gnome 3.14 in Ubuntu GNOME 3.14. by default Ubuntu GNOME 14.10 utopic unicorn shipped with GNOME 3.12, but, Ubuntu GNOME user can install the latest GNOME 3.14 from PPA.