We are havinng the same problem using tables and images.  The images remain for a short while and then become misplaced/a mess and we have been starting all over again.  Also, most times when I try to create a hyperlink behind the image it creates it.... and then a short while later it appears with an unwanted frame around the image.  We were using the 4.0 version and are now using 4.5 and still experiencing the same probelm.  Please help..