Background Information
When attempting to view a Project Detail view in PWA, some time passes while the system attempts to render the view, and eventually the system displays the following error:
Project Center cannot access the project(s) you are trying to view. It is most likely that you either don't have permissions to view the project, another user has deleted this project(s) before you were able to view it or that another user is in the process of publishing the project.
Resolution
The problem may be the result of a SQL timeout. If this is the case, you can observe the SQL server working for a while by running a trace before the events that cause the timeout error. You can also detect the SQL timeout in the ULS logs. To resolve the problem make sure that you rebuild the database indexes and update database statistics as part of your SQL maintenance plan for your Project Server databases.