I just reviewed these posts, and it occurred to me, if you are running
Windows, you can just print the document as a Microsoft XPS, saving it
in that format with a new name. Then open Adobe Acrobat and click the
"Create pdf" button; choose "from file" in the drop down menu, and click
on your new XPS file. Then save the file - it will be a flattened pdf of
the filled form.