diff --git a/src/MaterialEditor.Core/Core.MaterialEditor.CharaController.Edits.TextureShader.cs b/src/MaterialEditor.Core/Core.MaterialEditor.CharaController.Edits.TextureShader.cs
index d4b190b2..97d96da3 100644
--- a/src/MaterialEditor.Core/Core.MaterialEditor.CharaController.Edits.TextureShader.cs
+++ b/src/MaterialEditor.Core/Core.MaterialEditor.CharaController.Edits.TextureShader.cs
@@ -62,13 +62,18 @@ internal Action QueueMaterialTextureFromFile(
             // Track slot replacement without narrowing the caller's apply scope.
             var location = FindGameObject(objectType, slot);
             var target = new MaterialEditTarget(go, material, propertyName);
-            return _textureImports.Enqueue(target,
-                () => this != null && GetCoordinateIndex(objectType) == coordinate
+            var cancel = _textureImports.Enqueue(target,
+                () => this != null && isActiveAndEnabled && GetCoordinateIndex(objectType) == coordinate
                     && FindGameObject(objectType, slot) == location
                     && !CoordinateChanging && File.Exists(filePath),
                 done => { done(MaterialEditResult.FromApplied(
                     TrySetMaterialTextureFromFile(slot, objectType, material, propertyName, filePath, go))); return null; },
                 completed);
+            // A file-dialog callback can arrive after OnDisable stopped Update.
+            // Complete through the queue's normal cancellation path immediately.
+            if (!isActiveAndEnabled)
+                cancel?.Invoke();
+            return cancel;
         }
 
         private bool TrySetMaterialTextureFromFile(
diff --git a/src/MaterialEditor.Core/Core.MaterialEditor.CharaController.Events.cs b/src/MaterialEditor.Core/Core.MaterialEditor.CharaController.Events.cs
index 6274675f..8eb0f237 100644
--- a/src/MaterialEditor.Core/Core.MaterialEditor.CharaController.Events.cs
+++ b/src/MaterialEditor.Core/Core.MaterialEditor.CharaController.Events.cs
@@ -677,36 +677,31 @@ internal void HandleMaterialNameChange(int slot, ObjectType objectType, Renderer
             }
         }
 
+        private Coroutine _clothesMainTexRefresh;
+        private Coroutine _bodyMainTexRefresh;
+        private int _mainTexRefreshGeneration;
+
         /// <summary>
         /// Refresh the clothes MainTex, typically called after editing colors in the character maker
         /// </summary>
-        private EndOfFrameRefreshGate _clothesMainTexRefreshGate;
-        private EndOfFrameRefreshGate _bodyMainTexRefreshGate;
-
         public void RefreshClothesMainTex()
         {
-            if (!_clothesMainTexRefreshGate.TryRequest())
-            {
+            if (!isActiveAndEnabled || _clothesMainTexRefresh != null)
                 return;
-            }
-            try
-            {
-                if (StartCoroutine(RefreshClothesMainTexCoroutine()) != null)
-                    return;
-            }
-            catch
-            {
-                _clothesMainTexRefreshGate.Complete();
-                throw;
-            }
-            _clothesMainTexRefreshGate.Complete();
+
+            // A failed start leaves the handle null, so a later request can retry.
+            _clothesMainTexRefresh = StartCoroutine(
+                RefreshClothesMainTexCoroutine(_mainTexRefreshGeneration));
         }
 
-        private IEnumerator RefreshClothesMainTexCoroutine()
+        private IEnumerator RefreshClothesMainTexCoroutine(int generation)
         {
-            yield return new WaitForEndOfFrame();
             try
             {
+                yield return new WaitForEndOfFrame();
+                if (!isActiveAndEnabled || generation != _mainTexRefreshGeneration)
+                    yield break;
+
                 for (var i = 0; i < MaterialTexturePropertyList.Count; i++)
                 {
                     var property = MaterialTexturePropertyList[i];
@@ -726,7 +721,8 @@ private IEnumerator RefreshClothesMainTexCoroutine()
             }
             finally
             {
-                _clothesMainTexRefreshGate.Complete();
+                if (generation == _mainTexRefreshGeneration)
+                    _clothesMainTexRefresh = null;
             }
         }
 
@@ -778,28 +774,21 @@ private bool SetTextureWithProperty(GameObject go, MaterialTextureProperty textu
         /// </summary>
         public void RefreshBodyMainTex()
         {
-            if (!_bodyMainTexRefreshGate.TryRequest())
-            {
+            if (!isActiveAndEnabled || _bodyMainTexRefresh != null)
                 return;
-            }
-            try
-            {
-                if (StartCoroutine(RefreshBodyMainTexCoroutine()) != null)
-                    return;
-            }
-            catch
-            {
-                _bodyMainTexRefreshGate.Complete();
-                throw;
-            }
-            _bodyMainTexRefreshGate.Complete();
+
+            _bodyMainTexRefresh = StartCoroutine(
+                RefreshBodyMainTexCoroutine(_mainTexRefreshGeneration));
         }
 
-        private IEnumerator RefreshBodyMainTexCoroutine()
+        private IEnumerator RefreshBodyMainTexCoroutine(int generation)
         {
-            yield return new WaitForEndOfFrame();
             try
             {
+                yield return new WaitForEndOfFrame();
+                if (!isActiveAndEnabled || generation != _mainTexRefreshGeneration)
+                    yield break;
+
                 for (var i = 0; i < MaterialTexturePropertyList.Count; i++)
                 {
                     var property = MaterialTexturePropertyList[i];
@@ -812,9 +801,26 @@ private IEnumerator RefreshBodyMainTexCoroutine()
             }
             finally
             {
-                _bodyMainTexRefreshGate.Complete();
+                if (generation == _mainTexRefreshGeneration)
+                    _bodyMainTexRefresh = null;
             }
         }
+
+        private void CancelMainTexRefreshes()
+        {
+            // Invalidate before stopping: an old iterator's finally must not
+            // clear a refresh requested after this character is enabled again.
+            _mainTexRefreshGeneration++;
+            var clothesRefresh = _clothesMainTexRefresh;
+            var bodyRefresh = _bodyMainTexRefresh;
+            _clothesMainTexRefresh = null;
+            _bodyMainTexRefresh = null;
+            if (clothesRefresh != null)
+                StopCoroutine(clothesRefresh);
+            if (bodyRefresh != null)
+                StopCoroutine(bodyRefresh);
+        }
+
         /// <summary>
         /// Reapply all edits to the body and face
         /// </summary>
@@ -823,22 +829,5 @@ public void RefreshBodyEdits()
             if (CharacterLoading) return;
             StartCoroutine(LoadData(false, false, false));
         }
-        private struct EndOfFrameRefreshGate
-        {
-            private bool _pending;
-
-            internal bool TryRequest()
-            {
-                if (_pending)
-                    return false;
-                _pending = true;
-                return true;
-            }
-
-            internal void Complete()
-            {
-                _pending = false;
-            }
-        }
     }
 }
diff --git a/src/MaterialEditor.Core/Core.MaterialEditor.CharaController.cs b/src/MaterialEditor.Core/Core.MaterialEditor.CharaController.cs
index fe26e17a..22d506c5 100644
--- a/src/MaterialEditor.Core/Core.MaterialEditor.CharaController.cs
+++ b/src/MaterialEditor.Core/Core.MaterialEditor.CharaController.cs
@@ -160,6 +160,7 @@ protected override void OnReload(GameMode currentGameMode, bool maintainState)
         /// </summary>
         protected override void OnDestroy()
         {
+            CancelMainTexRefreshes();
             _textureImports.Dispose();
             ChaControl targetControl = null;
             GameObject targetRoot = null;
@@ -192,6 +193,12 @@ protected override void OnDestroy()
             }
         }
 
+        private void OnDisable()
+        {
+            CancelMainTexRefreshes();
+            _textureImports.CancelAll();
+        }
+
         private bool CurrentUiTargetBelongsToThisController()
         {
             var retainedTarget = MaterialEditorUI.RetainedTargetGameObject;