I assume you are using the Oracle WebDav client, in which case can you share the connection settings that you have used. Can you also check as what user are you establishing the connection and if the user has the access to folders.
Connection Settings Ref - Organizing Content - 11g Release 1 (11.1.1)
Yes, Oracle WebDav client definitely enhances WebDav interface. Oracle also offers Oracle WebCenter Content: Desktop (DIS), which can enhance the WebDAV client environment by more closely integrating with Windows Explorer, Microsoft Outlook, Lotus Notes, and other applications.