Quote Originally Posted by MistakeNot View Post
You need to continue with the MSQ up through the quest "Moving Forward"
Based on the OP's post, they've already started on the 5.1 MSQ, so they're well past that quest.

OP, is it possible that you've accidentally finished the unlock quest already? The unlock quest is named "The Crystalline Mean". To check if you've already completed it, go to the Journal, click Complete, click the Class & Job Quests icon, and select Crystalline Means Quests in the dropdown menu. If the quest isn't listed there, see if Katliss (or any NPCs near her) have any quests. Should be at around 10,8 in the Crystarium.