diff --git a/ProConPy/csp_solver.py b/ProConPy/csp_solver.py
index 05f525b..552e2cd 100644
--- a/ProConPy/csp_solver.py
+++ b/ProConPy/csp_solver.py
@@ -566,30 +566,29 @@ def _refresh_options_validities(self, var):
             The variable whose assignment triggers the refresh of the options validities of other variables.
         """
 
-        # Set of variables that have been visited
-        visited = set()
-
         # Queue of variables to be visited
         queue = [neig for neig in self._cgraph[var] if neig.has_options()]
 
+        # Set of all variables that have been queued
+        queued = set(queue)
+
         # Traverse the constraint graph to refresh the options validities of all possibly affected variables
         while queue:
 
-            # Pop the first variable from the queue and mark it as visited
+            # Pop the first variable from the queue
             var = queue.pop(0)
             logger.debug("Refreshing options validities of %s.", var)
-            visited.add(var)
 
-            # Update the validities of the variable and extend the list of variables to refresh
+            # Update the validities of the variable and extend the queue if necessary
             validities_changed = var.update_options_validities()
             if validities_changed:
-                queue.extend(
-                    [
-                        neig
-                        for neig in self._cgraph[var]
-                        if neig.has_options() and neig not in visited
-                    ]
-                )
+                extension = [
+                    neig
+                    for neig in self._cgraph[var]
+                    if neig.has_options() and neig not in queued
+                ]
+                queue.extend(extension)
+                queued.update(extension)
 
     def apply_assignment_assertions(self, solver, exclude_var=None, exclude_vars=None):
         """Apply the assignment assertions to the given solver. The assignment assertions are
diff --git a/tools/cgraph_plotter.py b/tools/cgraph_plotter.py
index ad695dc..de99542 100644
--- a/tools/cgraph_plotter.py
+++ b/tools/cgraph_plotter.py
@@ -11,8 +11,13 @@
 import networkx as nx
 import matplotlib.pyplot as plt
 from networkx.drawing.nx_pydot import graphviz_layout
+import os
 
 
+light_color = "sandybrown"
+dark_color = "sienna"
+highlight_color = "tomato"
+
 def initialize(cime):
     """Initializes visualCaseGen"""
     ConfigVar.reboot()
@@ -45,31 +50,79 @@ def plot_cgraph():
 
     G = gen_cgraph()
     pos = graphviz_layout(G, prog="sfdp")
+    plt.figure(figsize=(10, 5))
+
     nx.draw(
         G,
         pos,
         with_labels=False,
         node_size=100,
-        node_color="skyblue",
+        node_color=light_color,
         font_color="black",
         edge_color="gray",
         linewidths=0.5,
         width=0.5,
-        alpha=0.5,
+        alpha=0.7,
     )
 
     text = nx.draw_networkx_labels(G, pos)
     for _, t in text.items():
         # t.set_rotation(20)
         # t.set_verticalalignment("center_baseline")
-        t.set_fontsize(8)
+        t.set_fontsize(9)
 
-    plt.show()
+    #plt.show()
+    plt.savefig('cgraph.png')
 
+def animate_graph_traversal(traversal_list):
+    """Animates the graph traversal and saves the frames as png files."""
+    G = gen_cgraph()
+    pos = graphviz_layout(G, prog="sfdp")
+    fig, ax = plt.subplots()
+    frames = []
+
+    plt.figure(figsize=(10, 5))
+
+    for i, node in enumerate(traversal_list):
+        nx.draw(
+            G,
+            pos,
+            with_labels=False,
+            node_size=100,
+            node_color=light_color,
+            font_color="black",
+            edge_color="gray",
+            linewidths=0.5,
+            width=0.5,
+            alpha=0.7,
+        )
+        visited_nodes = set(traversal_list[:i+1])
+        text = nx.draw_networkx_labels(G, pos, labels={node: node if node in visited_nodes else "" for node in G.nodes()})
+        for _, t in text.items():
+            t.set_fontsize(9)
+            t.set_verticalalignment("bottom")
+        
+        # Dark color for already visited nodes
+        nx.draw_networkx_nodes(G, pos, nodelist=visited_nodes, node_color=dark_color, node_size=100)
+        
+        # Highlight the current node being traversed
+        nx.draw_networkx_nodes(G, pos, nodelist=[node], node_color=highlight_color, node_size=100)
+
+        # Highlight the edges in the current path
+        #if i > 0:
+        #    for j in range(i):
+        #        nx.draw_networkx_edges(G, pos, edgelist=[(traversal_list[j], traversal_list[j+1])], edge_color="red", width=2)
+        
+        # Save the frame as a png file
+        frame_path = f"frame_{i}.png"
+        frames.append(frame_path)
+        plt.savefig(frame_path)
+        plt.clf()
 
 def main():
     initialize(CIME_interface())
     plot_cgraph()
+    animate_graph_traversal([cvars["COMP_OCN"], cvars["COMP_ATM"], cvars["COMP_LND"], cvars["COMP_ICE"], cvars['COMP_OCN_PHYS'], cvars['COMP_OCN_OPTION']])
 
 
 if __name__ == "__main__":