Well, my apologies for having taken up your time with this issue. I must confess I never even saw the "Smarten punctuation" option in the Look & Feel section. It doesn't matter if my source file has smart quotes or not... Calibre will do it for me!
Although my original issue remains (a document with smart punctuation still will not convert), it is made irrelevant by this feature in Calibre.
It is easy enough for me to remove the smart punctuation from my source files and "dumb them down" and allow Calibre to handle the smartening for me, which I just tested on a file and works beautifully.
Many thanks for your help and for saying something that pointed me in the right direction. Your time is much appreciated!
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