I have went to the throat of the world, talked to Paarthurnax and then went and talked to Septimus.
I have two quests:
Elder Knowledge - Recover the Elder Scroll (since I know the location)
Descerning the Transmundane - Transcribe the Lexicon
I am in Black Reach behind the city - and the whole area is "not drawn" - its like the actual area is invisible. So I used the Clairaudience which walked me a path to the tower of Mzark. I actually walked through midair here - I am guessing there is a bridge that is invisible to the tower.
Now that I am there - i have both arrows in front of me "Transcibe the Lexicon" and "Tower of Mzark" Recover the Elder Scroll
I got a "Open door" - which I opened - now it says (A) Close Door
But it wont let me in.
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Id show you a picture but there just nothing in front of me but open space.
This seriously seriously svcks.