SSRS 2012 some users are not able to edit reports in the server

They should try the following:

• Open Report Builder 3.0 on their client machine.


• Click the round button at the top left corner of the window, and select Options.


• Where there is "Use this report server or SharePoint site by default:", type in the URL to a SharePoint site with Reporting Services features.


• Click OK, then at the bottom left of the application, there is "Current report server: ____ Disconnect".


• Click Disconnect, then Connect again. You might get a window to confirm the new report server, make sure it is the SharePoint one and click OK.

Does that work or give you a different error?