Upload and Download button is disabled in Webcenter Portal document explorer

Hi,

Does anyone of you experience the upload and download button in document explorer is always disabled or hidden? Whatever roles privilege we put it does not work unless you include the user in the default role "Moderator". We already raised this issue in Oracle support but their resolution is to upgrade the portal (for testing purpose only not sure if this will work as per Oracle support), however this is not easily accepted by our client because it is already in production server and we both have Development and Test servers and it its working fine there. So, our client