I would strongly recommend that you download and try the Editor:http://www.tracker-software.com/PDFXVE6.zip
The Viewer has been replaced by the Editor and is no longer under active development, so only issues that we deem critical would be fixed.
If the Editor displays the same issue, I would recommend that you make sure that the font is embedded within the document, or that the font is installed on her system, as it may be an issue with font substitution because the font isn't embedded in the document.
If posting files to this forum, you must archive the files to a ZIP, RAR or 7z file or they will not be uploaded.
Tracker Support (Europe)
Tracker Software Products Ltd.