[LesoP]

I use Vista and have had the problem of single apostrophes turning into doubles when converting pdf documents (saved from Word) to epubs in Calibre. If the document is not enormously long, one way of preventing the problem is to put all of the apostrophes in bold face. I discovered this by accident, but bold face apostrophes convert correctly, for some reason.

Good luck working through a whole novel doing this, though.... :/