I am having the same problem. Using Save as PDF, Options, and filling in Document Properties -- Title, Author, Subject, and Keywoods ...
In the resulting PDF, using Adobe Reader's Properties feature, the Title and Subject are present, but not the Author and Keywords.
FileMaker 11.0v2, on Mac 10.6.4, using Preview or Skim to view the PDF, this all works fine.
I am using FileMaker Pro 10.0v3 and Mac O.S. 10.4.11.