fixed some notification issues

NzbDrone.Core/Providers/NotificationProvider.cs

@@ -24,29 +24,41 @@ namespace NzbDrone.Core.Providers
         {
             get
             {
-
-                var activeNotification = _progressNotification.Values.Where(p => p.Status == ProgressNotificationStatus.InProgress).ToList();
+                lock (_lock)
+                {
+                    var activeNotification =
+                        _progressNotification.Values.Where(p => p.Status == ProgressNotificationStatus.InProgress).
+                            ToList();
 
                     if (activeNotification.Count == 0)
                     {
                         //Get notifications that were recently done
-                    activeNotification = _progressNotification.Values.Where(p => p.CompletedTime >= DateTime.Now.AddSeconds(-3)).OrderByDescending(c => c.CompletedTime).ToList();
+                        activeNotification =
+                            _progressNotification.Values.Where(p => p.CompletedTime >= DateTime.Now.AddSeconds(-3)).
+                                OrderByDescending(c => c.CompletedTime).ToList();
 
                     }
 
                     return activeNotification.ToList();
                 }
             }
+        }
 
         public virtual void Register(ProgressNotification notification)
+        {
+            lock (_lock)
             {
                 _progressNotification.Add(notification.Id, notification);
             }
+        }
 
         public virtual void Register(BasicNotification notification)
+        {
+            lock (_lock)
             {
                 _basicNotifications.Add(notification.Id, notification);
             }
+        }
 
         public virtual void Dismiss(Guid notificationId)
         {

NzbDrone.Web/Controllers/NotificationController.cs

@@ -52,13 +52,11 @@ namespace NzbDrone.Web.Controllers
         [HttpGet]
         public JsonResult Comet(string message)
         {
-            var requestTimer = Stopwatch.StartNew();
-
             MiniProfiler.Stop(true);
 
             var currentMessage = GetCurrentMessage();
 
-            while (message == currentMessage && requestTimer.Elapsed.TotalSeconds < 10)
+            while (message == currentMessage)
             {
                 Thread.Sleep(250);
                 currentMessage = GetCurrentMessage();

NzbDrone.Web/Scripts/Notification.js

@@ -42,9 +42,11 @@
 
     function closeMsg() {
         //hide the message      
+        if (isShown) {
             $('#msgBox').hide("slide", { direction: "right" }, speed);
             isShown = false;
         }
+    }
 });