As I recall, FM 8.5 and lower are not leopard (and presumably snow leopard) certified. Printing and saving to PDF was one of the issues.
I think it may be time to upgrade to FM10.
Thank you for your post.
Printing with FileMaker Pro 8.5 on Snow Leopard does not work. This is documented in Knowledge Base Article #7355:
Some users have found a way to print. You can print to PDF, or some users have gone into Preview Mode prior to printing.