You'll probably need to upgrade FileMaker to a newer version. I doubt that FMP 10 is fully compatible with OS 10.9
You might get lucky and find that a different or newer printer driver will work when your current one does not.
are you performing PDF export via the printer driver's 'save as pdf' or with FM built export function or script task?
I was exporting via FM's export function.
And for some unknown reason, today, I am having no problem printing "records being browsed". Very, very strange, but my problem seems to be solved. Thanks for your help, very much appreciated!