This problem is a continuing frustration since I first put in a support request on it many moons ago. The response I received was not to use MS Word then paste into listing template. I do not use MS Word. I use Notepad exclusively. For example, on a recent listing, I imported my text, blocked it and chose a font. I previewed the listing to confirm that all was well. However, a couple of days after the listing was posted I had occasion to open the listing in eBay, and guess what! Halfway through the description the font changed.
If nothing else, what one sees in Auctiva's preview ought to show what the listing will look like in EBay. Might as well take the "Preview" button off the page - it's not much use, is it?