diff --git a/ViewModels/RecipeGeneratorViewModel.cs b/ViewModels/RecipeGeneratorViewModel.cs
--- a/ViewModels/RecipeGeneratorViewModel.cs
+++ b/ViewModels/RecipeGeneratorViewModel.cs
@@ -90,7 +90,7 @@ namespace DesertPaintCodex.ViewModels
         private uint _minConcentration;
 
         private readonly ConcurrentQueue<PaintRecipe> _pendingNewRecipes = new();
-        private volatile int _newRecipeCount;
+        private ulong _newRecipeCount;
         private volatile bool _updatesAvailable;
         private readonly DispatcherTimer _updateTimer;
         
@@ -155,6 +155,8 @@ namespace DesertPaintCodex.ViewModels
                 _generator.Log = System.IO.Path.Combine(logDir, "recipe_generator_log.txt");
             }
 
+            CanClear = false;
+
             _generator.BeginRecipeGeneration(
                 _minConcentration, 
                 (uint)MaxConcentration, 
@@ -201,6 +203,7 @@ namespace DesertPaintCodex.ViewModels
                 _generator.Log = System.IO.Path.Combine(logDir, "recipe_generator_log.txt");
             }
 
+            CanClear = false;
             _generator.ResumeRecipeGeneration();
 
         }
@@ -299,7 +302,7 @@ namespace DesertPaintCodex.ViewModels
         #region Event Handlers
         private void OnProgress(object? sender, EventArgs args)
         {
-            _newRecipeCount = (int)_generator.RecipeCount;
+            _newRecipeCount = _generator.RecipeCount;
             _updatesAvailable = true;
         }
 
@@ -313,6 +316,7 @@ namespace DesertPaintCodex.ViewModels
         
         private void OnGeneratorStopped(object? sender, EventArgs args)
         {
+            Debug.WriteLine($"Generator stopped. Saving = {_saving}");
             if (_saving)
             {
                 SaveState();
@@ -346,7 +350,8 @@ namespace DesertPaintCodex.ViewModels
             DateTime now = DateTime.Now;
 
             // Update test count.
-            PermutationCount = $"{_newRecipeCount:n0}";
+            ulong newRecipeCount = _newRecipeCount;
+            PermutationCount = $"{newRecipeCount:n0}";
             
             // Pull in new recipes.
             if (!_pendingNewRecipes.IsEmpty)
@@ -387,12 +392,13 @@ namespace DesertPaintCodex.ViewModels
             
             if (_unsavedRecipes)
             {
+                Debug.WriteLine("Saving generator state.");
+                _saving = true;
+                _generator.Stop();
+
                 _profile.SaveRecipes();
                 _unsavedRecipes = false;
             }
-
-            _saving = true;
-            _generator.Stop();
         }
         
         #endregion