I do my main work on a Mac, but from time to time I transfer to a Windows box, as I can then work on the way to and from work.
I find that the ‘Page Break Before’ checkbox becomes unticked when a novel is moved from Mac to Windows, (but not, if I remember correctly, on the way back from Windows to Mac - I’ll check this next time I move back to the Mac).
Just a little niggle, but when you have 40 chapters to change it becomes a bit of a pain.