Index: Core/Gui/src/Core.Gui/Forms/Log/MessageWindow.cs
===================================================================
diff -u -r02168ebd32424310c7982f5185d67ce56ed52bd8 -r0619b0f5ad27c9042518823db3e2da8def7a6df5
--- Core/Gui/src/Core.Gui/Forms/Log/MessageWindow.cs	(.../MessageWindow.cs)	(revision 02168ebd32424310c7982f5185d67ce56ed52bd8)
+++ Core/Gui/src/Core.Gui/Forms/Log/MessageWindow.cs	(.../MessageWindow.cs)	(revision 0619b0f5ad27c9042518823db3e2da8def7a6df5)
@@ -59,6 +59,7 @@
         private readonly ConcurrentQueue<MessageData> newMessages = new ConcurrentQueue<MessageData>();
 
         private bool filtering;
+        private bool copying;
 
         /// <summary>
         /// Creates a new instance of <see cref="MessageWindow" />.
@@ -348,7 +349,7 @@
 
         private void MessagesDataGridViewCellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
         {
-            if (e.Value == null)
+            if (e.Value == null || copying)
             {
                 return;
             }
@@ -381,7 +382,9 @@
 
         private void ButtonCopyClick(object sender, EventArgs e)
         {
+            copying = true;
             ClipboardProvider.Clipboard.SetDataObject(messagesDataGridView.GetClipboardContent());
+            copying = false;
         }
 
         private void ButtonShowDetailsClick(object sender, EventArgs e)
Index: Core/Gui/test/Core.Gui.Test/Forms/Log/MessageWindowTest.cs
===================================================================
diff -u -rc84ccc03432a011ae6ab3d2645ad7cdfa6c9f64c -r0619b0f5ad27c9042518823db3e2da8def7a6df5
--- Core/Gui/test/Core.Gui.Test/Forms/Log/MessageWindowTest.cs	(.../MessageWindowTest.cs)	(revision c84ccc03432a011ae6ab3d2645ad7cdfa6c9f64c)
+++ Core/Gui/test/Core.Gui.Test/Forms/Log/MessageWindowTest.cs	(.../MessageWindowTest.cs)	(revision 0619b0f5ad27c9042518823db3e2da8def7a6df5)
@@ -38,7 +38,7 @@
         private MessageWindowLogAppender originalValue;
 
         [Test]
-        public void ParameteredConstructor_ExpectedValues()
+        public void Constructor_ExpectedValues()
         {
             // Setup
             var logAppender = new MessageWindowLogAppender();
@@ -441,7 +441,7 @@
                 IDataObject actualDataObject = ClipboardProvider.Clipboard.GetDataObject();
                 Assert.IsTrue(actualDataObject != null && actualDataObject.GetDataPresent(DataFormats.Text));
                 var actualContent = (string) actualDataObject.GetData(DataFormats.Text);
-                Assert.AreEqual("\t00:00:00\tmessage", actualContent);
+                Assert.AreEqual("WARN\t\tmessage\t00:00:00", actualContent);
             }
         }