Just upgraded from FrameMaker 7.2 to version 12. When I try to create a pdf of a book using .ps file, this crashes. When I use the SaveAsPDF option, the graphics either missing or only partially shown in the resulting PDF. Any ideas?

I just upgraded from FrameMaker 7.2 to version 12. When I create the .pdf of a book using the SaveAsPDF option, the many of the graphics are either missing or partially missing. Any ideas why?