title_body: Edits aren't being saved in Calibre
upvoted_answer: For safest saving work with text in the text field, whether in special programs (Calibre, Sigil) or writing a simple post in a discussion or forum, it is good to copy this text(ctrl + c)and paste(ctrl + v)to notepad (or its equivalent according operating system) and save it separately. 
  
  (For example, PSPad or Notepad++ highlights special characters)