PDF preview is using the currently automated instance of Acrobat or
Reader to display your form design. However, font locations are
different between the two applications. Designer takes its fonts from a
local font folder in its app directory whereas Acrobat/Reader will
attempt to resolve font names either through the windows font folder for
truetype, etc, and its own font folder located in Acrobat/Resource/Font.
If your designer font is not in the Resource folder and you have embed
fonts turned...