Nessus 5.0.3 has been released and is available at http://www.nessus.org/download/. This update contains the latest round of bug fixes and stability improvements. Security improvements include a stronger SSL configuration and more secure Windows default file permissions.
5.0.3 introduces better memory management, the ability to restrict sessions per user, and additional logging. For a full list of addressed issues, please review the Nessus 5.0.3 availability announcement at the Nessus Discussion Forum.