Don't know the answer. It may be that the file has been RESIZED AFTER being put into Lectora. Try this. For an offending object, delete it from Lectora page and re-add. Or better yet, put the same object on a new page from the image file, NOT copied from another page. If the problem goes away, the object has somehow been resized, either by tweaking the Lectora object or by redoing the object and replacing the object in the image folder AFTER it was inserted into Lectora.ben