Index: Core/Common/test/Core.Common.Gui.Test/ExceptionDialogTest.cs
===================================================================
diff -u -r56d072b8342f3e54ba89124ab918bd1529e257a3 -ra7f01e637ff4d5bb01b24211729969514d4edef7
--- Core/Common/test/Core.Common.Gui.Test/ExceptionDialogTest.cs	(.../ExceptionDialogTest.cs)	(revision 56d072b8342f3e54ba89124ab918bd1529e257a3)
+++ Core/Common/test/Core.Common.Gui.Test/ExceptionDialogTest.cs	(.../ExceptionDialogTest.cs)	(revision a7f01e637ff4d5bb01b24211729969514d4edef7)
@@ -20,6 +20,9 @@
 // All rights reserved.
 
 using System;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Text;
 using System.Threading;
 using System.Windows.Forms;
 using Core.Common.Gui.Commands;
@@ -244,7 +247,15 @@
                 var button = new ButtonTester("buttonCopyTextToClipboard");
 
                 // Call
-                button.Click();
+                try
+                {
+                    button.Click();
+                }
+                catch (Exception)
+                {
+                    WriteDebuggingInformation();
+                    throw;
+                }
 
                 // Assert
                 Assert.AreEqual(exception.ToString(), Clipboard.GetText());
@@ -333,5 +344,40 @@
 
             mocks.VerifyAll();
         }
+
+        #region Debugging Clipboard
+
+        [DllImport("user32.dll")]
+        private static extern IntPtr GetOpenClipboardWindow();
+
+        [DllImport("user32.dll")]
+        private static extern int GetWindowText(int hwnd, StringBuilder text, int count);
+
+        [DllImport("user32.dll")]
+        private static extern int GetWindowTextLength(int hwnd);
+
+        [DllImport("user32.dll", SetLastError = true)]
+        private static extern int GetWindowThreadProcessId(IntPtr hWnd, out int lpdwProcessId);
+
+        private static void WriteDebuggingInformation()
+        {
+            // Write id of process that blocks the Clipboard to Console
+            GetWindowThreadProcessId(GetOpenClipboardWindow(), out int processId);
+            Console.WriteLine($"Id of process that locks Clipboard = {Process.GetProcessById(processId)}");
+
+            // Write text of window that blocks the Clipboard to Console (if any)
+            IntPtr openClipboardWindow = GetOpenClipboardWindow();
+            if (openClipboardWindow == IntPtr.Zero)
+            {
+                Console.WriteLine("No window that locks Clipboard");
+            }
+            int int32Handle = openClipboardWindow.ToInt32();
+            int len = GetWindowTextLength(int32Handle);
+            var sb = new StringBuilder(len);
+            GetWindowText(int32Handle, sb, len);
+            Console.WriteLine($"Window that locks Clipboard = {sb}");
+        }
+
+        # endregion
     }
 }
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