Index: src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs
===================================================================
diff -u -r253 -r257
--- src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs	(.../DSoilModelPlugin.cs)	(revision 253)
+++ src/Deltares.DSoilModel.Forms/DSoilModelPlugin.cs	(.../DSoilModelPlugin.cs)	(revision 257)
@@ -220,9 +220,12 @@
 
             DataEventPublisher.OnDataListModified -= DataEventPublisherOnDataListModified;
             DataEventPublisher.OnAfterChange -= DataEventPublisherOnAfterChange;
+            DataEventPublisher.OnChanged -= DataEventPublisherOnChanged;
             DataEventPublisher.OnSelectionChanged -= DataEventPublisherOnSelectionChanged;
         }
 
+        
+
         public void Configure(MainForm aMainForm)
         {
             mainForm = aMainForm;
@@ -231,6 +234,7 @@
 
             DataEventPublisher.OnDataListModified += DataEventPublisherOnDataListModified;
             DataEventPublisher.OnAfterChange += DataEventPublisherOnAfterChange;
+            DataEventPublisher.OnChanged += DataEventPublisherOnChanged;
             DataEventPublisher.OnSelectionChanged += DataEventPublisherOnSelectionChanged;
 
             mainForm.RegisterNewFileHandler(CreateNewFile);
@@ -451,6 +455,18 @@
             }
         }
 
+        private void DataEventPublisherOnChanged(object sender, PublishEventArgs e)
+        {
+            if (UndoRedoManager.UseManager == false)
+            {
+                // note: as the UndoRedoManager is not sending EndAction events the validator can respond to, start it here (see DSB-473)
+                if (DSoilModelProject.IsAutoValidationEnabled)
+                {
+                    RealTimeBackgroundValidator.Instance.Start();
+                }
+            }
+        }
+
         private void DataEventPublisherOnAfterChange(object sender, PublishEventArgs publishEventArgs)
         {
             var localProject = sender as DSoilModelProject;
@@ -1745,7 +1761,16 @@
 
                 if (dialogResult == DialogResult.OK)
                 {
-                    project.RepairAllValidationResults();
+                    var cuCursor = Cursor.Current;
+                    try
+                    {
+                        Cursor.Current = Cursors.WaitCursor;
+                        project.RepairAllValidationResults();
+                    }
+                    finally
+                    {
+                        Cursor.Current = cuCursor;
+                    }                    
                 }
             }
         }