For everyone here who has glitches on "The Game", I have a step by step action that might save your game. It saved mine at least and since I couldn't find this solution on any forum I figured I'd post it and then begin a tally on how effective it is or if my game was just a lucky shot.
So I tried everybody else tricks: save, reload, look for enemies behind the wall, load a 2nd player in, etc.
Well, after loading a 2nd char in the game fails, my sis goes what if we load your char into my game and resave your char there? So we did, I went to her world instead, resaved my character on her game, then we exited it all. I reopened my game, and a quest path had appeared! I too had glitched at the tower doors, so the path lead me to the door where finally a open door options had appeared and I just finished the quest about five minutes ago now.
Let me now if this trick works for you too!