diff --git a/croppa/main.py b/croppa/main.py
index f9dd86c..33f74f2 100644
--- a/croppa/main.py
+++ b/croppa/main.py
@@ -206,11 +206,11 @@ class VideoEditor:
             # Restore state values
             if 'current_frame' in state:
                 self.current_frame = state['current_frame']
-            if 'crop_rect' in state and state['crop_rect']:
+            if 'crop_rect' in state and state['crop_rect'] is not None:
                 self.crop_rect = tuple(state['crop_rect'])
             if 'zoom_factor' in state:
                 self.zoom_factor = state['zoom_factor']
-            if 'zoom_center' in state and state['zoom_center']:
+            if 'zoom_center' in state and state['zoom_center'] is not None:
                 self.zoom_center = tuple(state['zoom_center'])
             if 'rotation_angle' in state:
                 self.rotation_angle = state['rotation_angle']
@@ -1373,6 +1373,7 @@ class VideoEditor:
             if self.crop_rect:
                 self.crop_history.append(self.crop_rect)
             self.crop_rect = (original_x, original_y, original_w, original_h)
+            self.save_state()  # Save state when crop is set
 
     def seek_to_timeline_position(self, mouse_x, bar_x_start, bar_width):
         """Seek to position based on mouse click on timeline"""
@@ -1387,6 +1388,7 @@ class VideoEditor:
             self.crop_rect = self.crop_history.pop()
         else:
             self.crop_rect = None
+        self.save_state()  # Save state when crop is undone
 
     def toggle_marker_looping(self):
         """Toggle looping between cut markers"""
@@ -1407,7 +1409,8 @@ class VideoEditor:
             self.seek_to_frame(self.cut_start_frame)
         else:
             print("Marker looping DISABLED")
-            
+        
+        self.save_state()  # Save state when looping is toggled
         return True
 
 
@@ -1481,6 +1484,8 @@ class VideoEditor:
                 new_x = x + amount
                 new_w = w - amount
                 self.crop_rect = (new_x, y, new_w, h)
+        
+        self.save_state()  # Save state when crop is adjusted
 
     def render_video(self, output_path: str):
         """Render video or save image with current edits applied"""
@@ -1965,16 +1970,19 @@ class VideoEditor:
                 if self.crop_rect:
                     self.crop_history.append(self.crop_rect)
                 self.crop_rect = None
+                self.save_state()  # Save state when crop is cleared
             elif key == ord("1"):
                 # Cut markers only for videos
                 if not self.is_image_mode:
                     self.cut_start_frame = self.current_frame
                     print(f"Set cut start at frame {self.current_frame}")
+                    self.save_state()  # Save state when cut start is set
             elif key == ord("2"):
                 # Cut markers only for videos
                 if not self.is_image_mode:
                     self.cut_end_frame = self.current_frame
                     print(f"Set cut end at frame {self.current_frame}")
+                    self.save_state()  # Save state when cut end is set
             elif key == ord("N"):
                 if len(self.video_files) > 1:
                     self.previous_video()