Update Book sometimes fails to apply master pages
Update Book has an option to apply master pages. If a body text frame on the resulting pages has a different size than that on the original page, content might overflow onto new pages. The new pages should use the master page specified in the master page mapping table. In some cases, however, the new pages use the default master page ("Right" in a single-sided document, "Left" or "Right" in a double-sided document).
This seems to happen to documents that are closed or open but not visible. Opening all documents in the book and placing them in separate windows with Window > Tile before updating the book produces the expected results.
I have provided a more detailed description and sample files in https://tracker.adobe.com/#/view/FRMAKER-7650.
--Lynne
