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Arkadian Hmmm, is there anything in Conversion->Look and Feel->Extra CSS or Filter Style Information - if there is, take a note of what's there and rip it out
If you want to zip up your test DOCX, and the template (DOTX) it uses... żdoes Writer have DOTX's... and the resultant EPUB, and post it here then I'll have a look at it.
I find it hard to believe that LO is not writing a valid DOCX, mainly because I think Kovid did his DOCX_Input PI testing on LO Writer created DOCX's. And I can say with near absolute certainty that my Keep with Next ticks in Word always translate into CSS styles that include the '
page-break-inside: avoid;' artefact
BR