Quote Originally Posted by PmpHesus View Post
Yes, it is the Great Gubal Library that is not unlocked.
Very weird.
You must finish the Great Gubal Library to progress in the MSQ to be able to reach the point where you unlock the Antitower.
So what you describe should be impossible.

Are you sure you haven't bought a story skip at some point? Or mis-stated something in your description of the problem?