I am getting fed up with indesign, if when quitting or whatever it offers to save changes to a book, I click ok and it opens a save as dialogue. These are new books in the latest format, previously created and saved on another day.
Why does it do that? Is it just another bug to add to the list I have?
Does it duplicate the files or is just the annoyance to have to save it every time? What version of ID are you using, Mac/Windows?
What version of InDesign do you have? Are you updated to the latest version?