My characters kept "teleporting" — a chapter would open somewhere different from where the last one left them. Is that fixed?

Yes, in v1.8.1. While writing fiction, BookyAI keeps a running recap of each finished chapter, and that recap now also records WHERE each character is at the chapter's end. The next chapter is generated with that information, so it picks everyone up in the right place. The improvement applies to chapters written or regenerated after updating; older chapters gain it as soon as you regenerate them.