After cleaning up permissions on our sites, I encountered a problem trying to access a site using the Data Source Library. I received an error: “The web <site url> cannot be opened.” When I opened the site in SPD the Data Source Library was grayed out. With the help of the Dean we found the problem. Somehow in my permissions cleaning the fpdatasources permissions were altered. I corrected the problem using the following steps:
1. Open the problem site in SPD
2. In the Folder List navigate to _catalogs/fpdatasources
3. Right-click fpdatasources and click the Security tab
4. Click “Manage permissions using the browser.”
5. Add the appropriate permissions.
You may have to refresh or restart SPD to see the change, but the Data Source Library should no longer be grayed out.