Thank you Virginia. The paper size issue you refer to seems to be a minefield, and not just for FTM users!
However, as described in my report, my problem does not occur with any 3rd party PDF printer driver I have tested. Also, rather than dealing with large FTM charts, my test case is the simplest and smallest! ie. just one home name and several children - enough to force a chart to have at least two pages.
Having A4 printers on my systems it is normal for the paper size to be always pre-defined to A4 in the default printer driver. I would not normally see a need to use the Page Setup window from within FTM to either change the paper size or to select a different printer. (Although using my XP systems this button is available. Note that I've done the same tests under W7).
So the only thing I’m doing which removes the problem is to use the FTM Page Setup option to change the paper size in the Page Setup window from A4 to Legal or Letter.
So do you think the PDF printing issues you refer to could have any relation to my problem?