Re: Black squares
Although why anyone in their right mind would choose Word for output formatting for professional commercial publication is anyone's guess (or LO for that matter).
Where content is only words plain text is more than adequate and keeps things mercifully simple and focussed (saves writers faffing around with formatting as a form of procrastination).
Once graphics are involved there are other professional packages far more suited to producing professional output than Word/LO - which are really just glorified letter compositors.