If this is a book that has a stylesheet altered by Calibre, go into "Look and Feel" in the conversion tab. Go down to Filter Style Information and check fonts (and margins if they are not adjusting). I have 32 drm free ePUBs on my Go at the moment and the fonts change on all of them. I did not have to make any changes on books that simply lost their DRM, but I did have to make the changes in Look and Feel on books that someone else had converted or altered in Calibre before I got them.
Last edited by taming; 10-06-2012 at 06:17 AM.