The question mark representation usually infers that the font in use doesn't contain the specified character. You may need to use another font that has a more complete unicode character set.
I changed my home font Adobe Garamond Pro font to TImes New Roman for the |Xam words. Perfect. Thank you so much. Strange that Adobe Garamond Pro (from the Adobe stable) can be less adaptive and have a less complete unicode character set than the "outsider" TNR. Surely Adobe could up the ante on its own fonts? Thanks again Arnis Gubins.