Reloaded, this time walked back manually to the north gate, entered. CTD. Reloaded again, told Saerileth to wait outside the gates before entering, and I got in fine, walked around a bit, no CTD. Used the "Summon Saerileth" spell to bring her in. CTD
I have come to the brilliant conclusion that it is indeed my companion who is causing these CTD's and have done a little searching (the forum topic in particular) and couldn't find anything. Has anybody else heard of/encountered this before? If so, please help as I get easily discouraged from playing OB when this starts happening as it happened my last install with CM as well.