Microsoft has released the service pack 2a for Project 2003 Server. It fixes the issues they had in SP2.
Project Server 2003 Service pack SP2a
Description of Project Server 2003 SP2 here
If you have modified PWA files in your deployment, then you should check this KB article before deploying Project Server SP2.
Project Professional 2003 service pack
Description of Project 2003 SP2 here
To deploy Project 2003 SP2 across your organization search the article “Distributing Office 2003 Product Updates”