Board Thread:General Discussion/@comment-73.18.38.35-20150717000323/@comment-6881629-20150717121010

That sounds pretty messed up, with the Greybeards i think you've got two conflicting quests going that'll stop each other from working. You needed to finish The Horn of Jurgen Windcaller fully when you got the horn defiantly before going to Sky Haven.

I think the only fix wound be a going back to a save before starting Alduin's Wall (at the least) and trying to fully finish the horn quest.