Do you have the Newsletters module present under Content section of the Sitefinity backend navigation? If yes, this is a very strange behavior, can you please let us know some more details about the project's background - did the problem apppear when it was initially created, or at a later point in time, have you upgraded it, and what is the current version of the project. A quick attempt to restore the functionality back to its default condition would be to uninstall and then reinstall the module. To do so, please first create a backup
of your project. Go to App_Data/Sitefinity/Configuration and edit SystemConfig.config. Remove the <add name="Newsletters"> line, save the file, restart the application and view the Backend. The Newsletters section under Content should not be present anymore. Then go back to SystemConfig.config, edit it and insert:
restart the application, and you should have the module reinstalled to your system. Looking forwards to your reply.
the Telerik team
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