[rjwse@aol.com]

Thank you for your reply. I am intrigued with the notion that docx offers more capable features than does odt. I have tried saving my Ubuntu odt file as docx, then processing through calibre. The borders around frames vanish. I have made a search, but cannot find a list of the additional capabilities of docx over odt. Can you direct me?

Presently, the latest version of LibreOffice has a group of errors which have sprung up due to the inclusion of sidebar popups for navigator, styles, etc. For one thing, colors within frames are not presently saved, but revert to white.