I guess that it's not possible to continue my saved games now that I've moved to 3.1? I loaded an earlier save (where I was still doing the previous quest) so that I could start the quest with Tate from scratch, but now there seems to be some problems. Throughout the city, two of each character can be seen walking around, some earlier scripts seem to be re-running themselves, and my framerate has fallen into the single digits.
I'm only loading Arktwend_English.esm in the data files list, but when I loaded a save game from before my update, it says that the master file is different from the saved game. That didn't surprise me as I knew that already, but then it says that the local count for "rune arka" doesn't match, so it wants to re-initialize. I chose "yes to all", and then the game loaded with the above problems.
If I have to start over, it's okay. I want to try a different character build anyway.
Thanks for all your work on this John!