Hi,
I encountered the following problem when converting from docx to epub: The resulting epub does not contain pages consisted of only one character in docx (in my case pages with one-digit name of part of the book).
Workaround attempts via adding hard spaces were not successful. So far the only way (in docx) seems to be to add some "real" text to the problematic page.
Or maybe am I doing wrong something?
(Calibre 4.15; test docx + epub attached)
OneCharacterPageProblem.docx
OneCharacterPageProblem.epub