Urgent Dropbox API V2 2/files/list_folder/continue

Hello Greg 

Thank you for your prompt response. I am amazed that its working now. Can you please guide me how much time it would take to fetch changeset details from dropbox because sometimes it fetches quickly and sometimes it takes our breath away by not fetching files on time.
This is my piece of code which execute after every 5 minutes to get changes from server.

  var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://api.dropbox.com/2/files/list_folder/continue");
                httpWebRequest.Method = "POST";
                httpWebRequest.Headers.Add("Authorization: Bearer " + GeneratedAccessToken);
                httpWebRequest.ContentType = "application/json";

                using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
                {
                    string json = new JavaScriptSerializer().Serialize(new { cursor = cursor_ });
                    streamWriter.Write(json);
                }
                string responseBody = "";
                var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
                {
                    var result = streamReader.ReadToEnd();
                    responseBody = result;
                }

Did you set include_media_info=true on /2/files/list_folder (not /continue) when you called it to retrieved the cursor initially? If you requested media information, there can be a delay before new entries will be returned (including from /continue), while the media information is being extracted. If not, the entries should be available almost immediately.