diff --git a/ObjectManipulationManager.cs b/ObjectManipulationManager.cs
index ef61fe9..d828e4c 100644
--- a/ObjectManipulationManager.cs
+++ b/ObjectManipulationManager.cs
@@ -74,6 +74,8 @@ namespace CtrEditor
         private Image _backgroundImage;      // Add this line
         internal bool IsDraggingCanvas { get; set; }
         private bool _isRectangleSelectionActive;
+        private bool _selectedObjectsAreVisible;
+
         public bool IsRectangleSelectionActive
         {
             get => _isRectangleSelectionActive;
@@ -181,35 +183,37 @@ namespace CtrEditor
         public void AddResizeRectangles(IEnumerable<osBase> selectedObjects)
         {
             double rectHighlightSize = 1;
-            RemoveResizeRectangles();
+            RemoveResizeRectangles();            
 
             // Calcular el bounding box que contenga todos los objetos seleccionados
             Rect boundingBox = CalculateTotalBoundingBox(selectedObjects);
+            if (_selectedObjectsAreVisible) {
 
-            FuncionesBase.MutableRect rectBox = new FuncionesBase.MutableRect(boundingBox);
-            rectBox.Left -= (float)rectHighlightSize;
-            rectBox.Right += (float)rectHighlightSize;
-            rectBox.Top -= (float)rectHighlightSize;
-            rectBox.Bottom += (float)rectHighlightSize;
+                FuncionesBase.MutableRect rectBox = new FuncionesBase.MutableRect(boundingBox);
+                rectBox.Left -= (float)rectHighlightSize;
+                rectBox.Right += (float)rectHighlightSize;
+                rectBox.Top -= (float)rectHighlightSize;
+                rectBox.Bottom += (float)rectHighlightSize;
 
-            _transformedBoundingBoxCenter = new Point(
-                boundingBox.Left + boundingBox.Width / 2,
-                boundingBox.Top + boundingBox.Height / 2
-            );
+                _transformedBoundingBoxCenter = new Point(
+                    boundingBox.Left + boundingBox.Width / 2,
+                    boundingBox.Top + boundingBox.Height / 2
+                );
 
-            // Selection rectangle
-            Rectangle selectionRect = CreateSelectionRectangle(rectBox, rectHighlightSize);
-            _resizeRectangles.Add(selectionRect);
-            _canvas.Children.Add(selectionRect);
+                // Selection rectangle
+                Rectangle selectionRect = CreateSelectionRectangle(rectBox, rectHighlightSize);
+                _resizeRectangles.Add(selectionRect);
+                _canvas.Children.Add(selectionRect);
 
-            // Load rotation cursors
-            Cursor rotationCursorRx = new Cursor(Application.GetResourceStream(
-                new Uri("pack://application:,,,/CtrEditor;component/Icons/rotationRx.cur")).Stream);
-            Cursor rotationCursorSx = new Cursor(Application.GetResourceStream(
-                new Uri("pack://application:,,,/CtrEditor;component/Icons/rotationSx.cur")).Stream);
+                // Load rotation cursors
+                Cursor rotationCursorRx = new Cursor(Application.GetResourceStream(
+                    new Uri("pack://application:,,,/CtrEditor;component/Icons/rotationRx.cur")).Stream);
+                Cursor rotationCursorSx = new Cursor(Application.GetResourceStream(
+                    new Uri("pack://application:,,,/CtrEditor;component/Icons/rotationSx.cur")).Stream);
 
-            // Add resize/rotation handles
-            AddResizeHandles(rectBox, 10, rotationCursorRx, rotationCursorSx);
+                // Add resize/rotation handles
+                AddResizeHandles(rectBox, 10, rotationCursorRx, rotationCursorSx);
+            }
         }
 
         private Rect CalculateTotalBoundingBox(IEnumerable<osBase> selectedObjects)
@@ -218,10 +222,11 @@ namespace CtrEditor
             double top = double.MaxValue;
             double right = double.MinValue;
             double bottom = double.MinValue;
+            _selectedObjectsAreVisible = false;
 
             foreach (var obj in selectedObjects)
             {
-                if (obj.VisualRepresentation != null)
+                if (obj.VisualRepresentation != null && obj.VisualRepresentation.Visibility!=Visibility.Collapsed)
                 {
                     // Obtener el bounding box del objeto actual
                     Rect objectBounds = VisualTreeHelper.GetDescendantBounds(obj.VisualRepresentation);
@@ -233,6 +238,7 @@ namespace CtrEditor
                     top = Math.Min(top, transformedBounds.Top);
                     right = Math.Max(right, transformedBounds.Right);
                     bottom = Math.Max(bottom, transformedBounds.Bottom);
+                    _selectedObjectsAreVisible = true;
                 }
             }
 
diff --git a/ObjetosSim/osBase.cs b/ObjetosSim/osBase.cs
index 1a0df2e..098775a 100644
--- a/ObjetosSim/osBase.cs
+++ b/ObjetosSim/osBase.cs
@@ -382,7 +382,10 @@ namespace CtrEditor.ObjetosSim
 
                     if (Angulo != 0)
                     {
-                        RotateTransform rotateTransform = new RotateTransform(-Angulo);
+                        // TransformedBitmap only accepts rotations in 90-degree increments
+                        // Round to nearest 90 degrees: 0, 90, 180, or 270
+                        double normalizedAngle = Math.Round(Angulo / 90.0) * 90.0;
+                        RotateTransform rotateTransform = new RotateTransform(-normalizedAngle);
                         transformedBitmap.Transform = rotateTransform;
                     }
 
@@ -463,7 +466,10 @@ namespace CtrEditor.ObjetosSim
 
                     if (Angulo != 0)
                     {
-                        RotateTransform rotateTransform = new RotateTransform(-Angulo);
+                        // TransformedBitmap only accepts rotations in 90-degree increments
+                        // Round to nearest 90 degrees: 0, 90, 180, or 270
+                        double normalizedAngle = Math.Round(Angulo / 90.0) * 90.0;
+                        RotateTransform rotateTransform = new RotateTransform(-normalizedAngle);
                         transformedBitmap.Transform = rotateTransform;
                     }