I was doing the quest " the fallen" (where you capture Odahviing) for the umpteenth time, but he will not be lured forward. I have reloaded my game several times to no effect and even used the console to advance the quest, allowing me to talk to him, but he just disappears afterward.
Sometimes when I load the autosave that the game creates right after your character jumps off the wagon at Helghen it goes smoothly until Alduin is supposed to land on the tower, at which point he just flies around making noise for however long you decide to wait for him to do his job, so I know that feel. Sadly, though, I have no idea how to help.