Exactly. I'd quicksaved immediately after entering the forbidden room and stealing the book. Obviously no one was hostile at that time. I THEN got the Parable quest. As soon as I loaded my quicksave, they attacked me on sight. The workaround mentioned here does not work. If this reputation cost really affects the Eder storyline, then the bug is nearly game breaking. Now I have to roll back and play from the temple of Woedica.
2+ hour lost, nice work Obsidian, nice work. Next time please add a kindly notification at the loading screens, to remind us to save (not quicksave) the game every 2 minutes because you never know what'll break the next time.