Thank you for your post.
Yes, you will not be able to print with FileMaker Pro 8.5 running under Snow Leopard. This is a known issue. Please see Knowledge Base Articles #7355 and #7359 for more information:
The workaround by saving to PDF is recommended.
I ran across this issue today with a client. We found a faster way to bypass this bug without having to save a PDF. Click the "preview" button in the print dialogue box and then click "print" once Preview has launched with the print preview.
Using Preview then clicking Print worked great. i upgraded to Mac OSx.6 because I purchased QuickBooks 2011 and that wouldn't work with Mac OSx.4. I was assured there would be no problems with this switch but there were, of course, however the printing problem of FM Pro 8.5 was the biggest. I will eventually upgrade my FM Pro 8.5 but am thankful I don't have to do it right away.