Do not delete or rename the Shared Workspace Pages folder. If this folder is inadvertently deleted, recreate it (with the name of Shared Workspace Pages) in the root of the repository. If the folder is renamed, Shared Workspace Pages are not shown.
The location of the Shared Workspace Pages folder is set in the Web Application User Interface properties. (Select Navigate, then Administer, then Reporting and Analysis, and then Web Applications; then, right-click Reporting and Analysis Framework Web-Application, select Properties, and go to the User Interface tab.) See User Interface Properties.