Page Layout settings defaulting

I am using Visio 2003/SP2. I manage alot of drawings, all various page sizes
and orientations, sometimes different within the file itself. I've noticed
that lately, everything is defaulting down to 8.5X11 in the Page
Setup>Printer Setup, instead of reading the page's actual size. I'm usually
printing to Adobe 8. I'm having to reset all ages every time I open the file.
Is there somewhere I can tell either Visio or Acrobat to use the page's true
size?

I've poked around in most options and settings, and searched Help with no
luck.