Fixed: Some timing issues in Sabnzbd RetryDownload logic.

src/NzbDrone.Core/Download/Clients/Sabnzbd/Sabnzbd.cs

@@ -239,17 +239,31 @@ namespace NzbDrone.Core.Download.Clients.Sabnzbd
 
             if (history.Count() != 1)
             {
+                _logger.Debug("History item missing. Couldn't get the new nzoid.");
                 return id;
             }
 
-            var queue = GetQueue().Where(v => v.Category == history.First().Category && v.Title == history.First().Title).ToList();
-
-            if (queue.Count() != 1)
+            var queue = new List<DownloadClientItem>();
+            for (int i = 0; i < 3; i++)
             {
-                return id;
+                queue = GetQueue().Where(v => v.Category == history.First().Category && v.Title == history.First().Title).ToList();
+
+                if (queue.Count() == 1)
+                {
+                    return queue.First().DownloadClientId;
+                }
+
+                if (queue.Count() > 2)
+                {
+                    _logger.Debug("Multiple items with the correct title. Couldn't get the new nzoid.");
+                    return id;
+                }
+
+                System.Threading.Thread.Sleep(500);
             }
 
-            return queue.First().DownloadClientId;
+            _logger.Debug("No items with the correct title. Couldn't get the new nzoid.");
+            return id;
         }
 
         protected IEnumerable<SabnzbdCategory> GetCategories(SabnzbdConfig config)

src/NzbDrone.Core/Download/DownloadTrackingService.cs

@@ -147,7 +147,7 @@ namespace NzbDrone.Core.Download
                             State = TrackedDownloadState.Unknown
                         };
 
-                        _logger.Trace("Started tracking download from history: {0}: {1}", trackedDownload.TrackingId, downloadItem.Title);
+                        _logger.Debug("Started tracking download from history: {0}: {1}", trackedDownload.TrackingId, downloadItem.Title);
                         stateChanged = true;
                     }
 
@@ -167,7 +167,7 @@ namespace NzbDrone.Core.Download
                     _logger.Debug("Item removed from download client by user: {0}: {1}", downloadItem.TrackingId, downloadItem.DownloadItem.Title);
                 }
 
-                _logger.Trace("Stopped tracking download: {0}: {1}", downloadItem.TrackingId, downloadItem.DownloadItem.Title);
+                _logger.Debug("Stopped tracking download: {0}: {1}", downloadItem.TrackingId, downloadItem.DownloadItem.Title);
             }
 
             _trackedDownloadCache.Set("tracked", newTrackedDownloads.Values.ToArray());