Hi Steven: 1/ Preview does not show all types of annotations or interactive elements in PDFs, so if the column headings were encoded as interactive annotations, they might not show up in Preview.
2/ To explore this further: If you try to select the text in the document, including the area where the headings should be, do the headings appear in any way (e.g. are they white-on-white or something)? Also, if you use Preview to 'search' for the titles, can it find them? If the answer is "no" to both of these questions, perhaps the headings are annotations. Otherwise, I do not know why, but perhaps there is a new version of PDF that Preview doesn't render correctly. James
