diff --git a/OpenSim/Region/ClientStack/Linden/UDP/J2KImage.cs b/OpenSim/Region/ClientStack/Linden/UDP/J2KImage.cs
index 976d6f93e8..474d2a5476 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/J2KImage.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/J2KImage.cs
@@ -377,6 +377,9 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
         private void AssetReceived(string id, Object sender, AssetBase asset)
         {
+//            m_log.DebugFormat(
+//                "[J2KIMAGE]: Received asset {0} ({1} bytes)", id, asset != null ? asset.Data.Length.ToString() : "n/a");
+
             UUID assetID = UUID.Zero;
             if (asset != null)
             {
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLImageManager.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLImageManager.cs
index 7bfb844b8e..a48251f9c0 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLImageManager.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLImageManager.cs
@@ -55,18 +55,29 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
         private bool m_shuttingdown;
         private AssetBase m_missingImage;
-        private IClientAPI m_client; //Client we're assigned to
-        private IAssetService m_assetCache; //Asset Cache
-        private IJ2KDecoder m_j2kDecodeModule; //Our J2K module
+        private IAssetService m_assetCache;
+        private IJ2KDecoder m_j2kDecodeModule;
+
+        /// <summary>
+        /// Priority queue for determining which image to send first.
+        /// </summary>
         private C5.IntervalHeap<J2KImage> m_priorityQueue = new C5.IntervalHeap<J2KImage>(10, new J2KImageComparer());
+
+        /// <summary>
+        /// Used to control thread access to the priority queue.
+        /// </summary>
         private object m_syncRoot = new object();
 
-        public IClientAPI Client { get { return m_client; } }
+        /// <summary>
+        /// Client served by this image manager
+        /// </summary>
+        public IClientAPI Client { get; private set; }
+
         public AssetBase MissingImage { get { return m_missingImage; } }
 
         public LLImageManager(IClientAPI client, IAssetService pAssetCache, IJ2KDecoder pJ2kDecodeModule)
         {
-            m_client = client;
+            Client = client;
             m_assetCache = pAssetCache;
 
             if (pAssetCache != null)
@@ -90,7 +101,9 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
                 // Do a linear search for this texture download
                 lock (m_syncRoot)
+                {
                     m_priorityQueue.Find(delegate(J2KImage img) { return img.TextureID == newRequest.RequestedAssetID; }, out imgrequest);
+                }
 
                 if (imgrequest != null)
                 {
@@ -178,8 +191,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                         imgrequest = new J2KImage(this);
                         imgrequest.J2KDecoder = m_j2kDecodeModule;
                         imgrequest.AssetService = m_assetCache;
-                        imgrequest.AgentID = m_client.AgentId;
-                        imgrequest.InventoryAccessModule = m_client.Scene.RequestModuleInterface<IInventoryAccessModule>();
+                        imgrequest.AgentID = Client.AgentId;
+                        imgrequest.InventoryAccessModule = Client.Scene.RequestModuleInterface<IInventoryAccessModule>();
                         imgrequest.DiscardLevel = newRequest.DiscardLevel;
                         imgrequest.StartPacket = Math.Max(1, newRequest.PacketNumber);
                         imgrequest.Priority = newRequest.Priority;
@@ -210,7 +223,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 if (image.IsDecoded)
                 {
                     int sent;
-                    bool imageDone = image.SendPackets(m_client, packetsToSend - packetsSent, out sent);
+                    bool imageDone = image.SendPackets(Client, packetsToSend - packetsSent, out sent);
                     packetsSent += sent;
 
                     // If the send is complete, destroy any knowledge of this transfer
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/Tests/LLImageManagerTests.cs b/OpenSim/Region/ClientStack/Linden/UDP/Tests/LLImageManagerTests.cs
index f176964ae4..1b68d68765 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/Tests/LLImageManagerTests.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/Tests/LLImageManagerTests.cs
@@ -46,6 +46,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP.Tests
     public class LLImageManagerTests
     {
         private AssetBase m_testImageAsset;
+        private Scene scene;
         private LLImageManager llim;
         private TestClient tc;
 
@@ -78,21 +79,21 @@ namespace OpenSim.Region.ClientStack.LindenUDP.Tests
 
             J2KDecoderModule j2kdm = new J2KDecoderModule();
 
-            Scene scene = SceneHelpers.SetupScene();
+            scene = SceneHelpers.SetupScene();
             SceneHelpers.SetupSceneModules(scene, j2kdm);
 
-            scene.AssetService.Store(m_testImageAsset);
-
             tc = new TestClient(SceneHelpers.GenerateAgentData(userId), scene);
             llim = new LLImageManager(tc, scene.AssetService, j2kdm);
         }
 
         [Test]
-        public void TestRequestAndSendImage()
+        public void TestSendImage()
         {
             TestHelpers.InMethod();
 //            XmlConfigurator.Configure();
 
+            scene.AssetService.Store(m_testImageAsset);
+
             TextureRequestArgs args = new TextureRequestArgs();
             args.RequestedAssetID = m_testImageAsset.FullID;
             args.DiscardLevel = 0;
@@ -107,11 +108,13 @@ namespace OpenSim.Region.ClientStack.LindenUDP.Tests
         }
 
         [Test]
-        public void TestRequestAndDiscardImage()
+        public void TestDiscardImage()
         {
             TestHelpers.InMethod();
 //            XmlConfigurator.Configure();
 
+            scene.AssetService.Store(m_testImageAsset);
+
             TextureRequestArgs args = new TextureRequestArgs();
             args.RequestedAssetID = m_testImageAsset.FullID;
             args.DiscardLevel = 0;
@@ -133,5 +136,25 @@ namespace OpenSim.Region.ClientStack.LindenUDP.Tests
 
             Assert.That(tc.SentImageDataPackets.Count, Is.EqualTo(0));
         }
+
+        [Test]
+        public void TestMissingImage()
+        {
+            TestHelpers.InMethod();
+//            XmlConfigurator.Configure();
+
+            TextureRequestArgs args = new TextureRequestArgs();
+            args.RequestedAssetID = m_testImageAsset.FullID;
+            args.DiscardLevel = 0;
+            args.PacketNumber = 1;
+            args.Priority = 5;
+            args.requestSequence = 1;
+
+            llim.EnqueueReq(args);
+            llim.ProcessImageQueue(20);
+
+            Assert.That(tc.SentImageDataPackets.Count, Is.EqualTo(0));
+            Assert.That(tc.SentImageNotInDatabasePackets.Count, Is.EqualTo(1));
+        }
     }
 }
\ No newline at end of file
diff --git a/OpenSim/Tests/Common/Mock/TestClient.cs b/OpenSim/Tests/Common/Mock/TestClient.cs
index fcfa43a7d6..6dbb2cd7f1 100644
--- a/OpenSim/Tests/Common/Mock/TestClient.cs
+++ b/OpenSim/Tests/Common/Mock/TestClient.cs
@@ -60,6 +60,7 @@ namespace OpenSim.Tests.Common.Mock
 
         public List<ImageDataPacket> SentImageDataPackets { get; private set; }
         public List<ImagePacketPacket> SentImagePacketPackets { get; private set; }
+        public List<ImageNotInDatabasePacket> SentImageNotInDatabasePackets { get; private set; }
 
 // disable warning: public events, part of the public API
 #pragma warning disable 67
@@ -454,6 +455,7 @@ namespace OpenSim.Tests.Common.Mock
 
             SentImageDataPackets = new List<ImageDataPacket>();
             SentImagePacketPackets = new List<ImagePacketPacket>();
+            SentImageNotInDatabasePackets = new List<ImageNotInDatabasePacket>();
         }
 
         /// <summary>
@@ -821,6 +823,10 @@ namespace OpenSim.Tests.Common.Mock
 
         public void SendImageNotFound(UUID imageid)
         {
+            ImageNotInDatabasePacket p = new ImageNotInDatabasePacket();
+            p.ImageID.ID = imageid;
+
+            SentImageNotInDatabasePackets.Add(p);
         }
 
         public void SendShutdownConnectionNotice()