The error message from the python.log:
2010-09-21 12:23:13,991 WARNING pdfhandler:625 - Firefox timed out while waiting for the report to be rendered - Incomplete snapshot generated
2010-09-21 12:23:13,991 WARNING Firefox timed out while waiting for the report to be rendered - Incomplete snapshot generated
2010-09-21 12:23:13,992 WARNING xvfb:132 - Stopping X Server 5
2010-09-21 12:23:13,992 WARNING Stopping X Server 5
Here are a few areas to check:
Have the user increase the firefox_timeout limit under the pdf_server.conf file so that the search has enough time to render a complete snapshot.
Also, make sure that the savedseach was created by an admin role. Change the savedsearch permission from private to this app only and provide read and write permission to the appropriate roles.