I hate to be the bearer of bad news but unless there is a work around, I doubt it very much that there will be a patch for this. FM8.5 is 2 versions old and considering that snow leopard just came out its most definitely not certified with 8.5.
Thank you for your post.
Knowledge Base Article #7355 talks about printing with Snow Leopard and earlier versions of FileMaker Pro.
As you have discovered, FileMaker Pro 8.5 will not print in Snow Leopard.
Your options are either continue to use the Preview-Print option, return to Leopard OS (10.5.x) or update to FileMaker Pro 10.