do you see a "Back" option in one of the submenus while you're in the skills menu page? Z isn't usually the button to go back, esc can cancel the menu and bring you back to where you were before.
just confirming again - this is in one of the maps where where there aren't much quests yet, right? If so, I added a few things that should help fix the problem, let me know if it's still persistent!
