You're right, kovidgoyal. The problem is not with titles, the problem only happens with authors and series. And it doesn't seem to be a db.setmetadata() problem, neither.
Looking at debug window, I see a "get categories: item xxx is not in series list" when trying to update the xxx serie in a book to XXX. I'll look at that.
Thanks for your help, and sorry for the inconvenience.
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