diff --git a/Filtration/ViewModels/ItemFilterBlockGroupViewModel.cs b/Filtration/ViewModels/ItemFilterBlockGroupViewModel.cs
index d4fd44b..f88b715 100644
--- a/Filtration/ViewModels/ItemFilterBlockGroupViewModel.cs
+++ b/Filtration/ViewModels/ItemFilterBlockGroupViewModel.cs
@@ -28,7 +28,6 @@ namespace Filtration.ViewModels
             ParentGroup = parent;
             Advanced = itemFilterBlockGroup.Advanced;
             SourceBlockGroup = itemFilterBlockGroup;
-            SourceBlockGroup.ClearStatusChangeSubscribers();
             SourceBlockGroup.BlockGroupStatusChanged += OnSourceBlockGroupStatusChanged;
             IsShowChecked = itemFilterBlockGroup.IsShowChecked;
             IsEnableChecked = itemFilterBlockGroup.IsEnableChecked;
@@ -256,5 +255,18 @@ namespace Filtration.ViewModels
                 IsEnableChecked = SourceBlockGroup.IsEnableChecked;
             }
         }
+
+        public void ClearStatusChangeSubscriptions()
+        {
+            if (SourceBlockGroup != null)
+            {
+                SourceBlockGroup.BlockGroupStatusChanged -= OnSourceBlockGroupStatusChanged;
+            }
+
+            foreach (var child in ChildGroups)
+            {
+                child.ClearStatusChangeSubscriptions();
+            }
+        }
     }
 }
diff --git a/Filtration/ViewModels/ToolPanes/BlockGroupBrowserViewModel.cs b/Filtration/ViewModels/ToolPanes/BlockGroupBrowserViewModel.cs
index 8fd0da0..e84cbba 100644
--- a/Filtration/ViewModels/ToolPanes/BlockGroupBrowserViewModel.cs
+++ b/Filtration/ViewModels/ToolPanes/BlockGroupBrowserViewModel.cs
@@ -107,6 +107,14 @@ namespace Filtration.ViewModels.ToolPanes
 
         private ObservableCollection<ItemFilterBlockGroupViewModel> RebuildBlockGroupViewModels(bool showAdvanced)
         {
+            if (BlockGroupViewModels != null)
+            {
+                foreach (var viewModel in BlockGroupViewModels)
+                {
+                    viewModel.ClearStatusChangeSubscriptions();
+                }
+            }
+
             // This assumes that there will only ever be a single root node.
             return new ObservableCollection<ItemFilterBlockGroupViewModel>
             (