Printing problems

These printing problems are about to drive me up the wall in Suse 10. Don't know if it is Suse 10 or Linux in general. I open a PDF file in Opera which opens KPDF. When I print, it prints A4 eventhough the printer is setup for letter in Yast, CUPS, and KDE print manager and the file itself is a letter size document. If I save the file, and open it in Acrobat, it prints OK, but openening it in KPF still wants to print A4. Why is this? Is there some hidden configuration file somewhere I am not aware of? Art