diff --git a/site_ansto/instrument/util/config_edit.py b/site_ansto/instrument/util/config_edit.py
index 7cf77579..bdb974a2 100755
--- a/site_ansto/instrument/util/config_edit.py
+++ b/site_ansto/instrument/util/config_edit.py
@@ -359,7 +359,7 @@ class InstConfigData:
         for imp in self.imp_dict[opt_desc['imptype']]:
             yield imp
 
-    def cf_statechange(self, cfg_id, new_state, udat=None):
+    def cf_statechange(self, cfg_id, new_state):
         """Change the given instrument configuration state."""
         self.configuration_dict[cfg_id]['enabled'] = new_state
 
@@ -498,12 +498,12 @@ class InstConfigManager:
                                       user_data=opt)
         return rb_lw
 
-    def cf_statechange(self, button, new_state, udat=None):
+    def cf_statechange(self, button, new_state):
         """Update option list when an instrument configuration is selected and
         notify InstConfigData object.
         """
         cfg_id = button.get_label()
-        self.cf_dat.cf_statechange(cfg_id, new_state, udat)
+        self.cf_dat.cf_statechange(cfg_id, new_state)
         cascade = self.cf_dat.configuration_dict[cfg_id]['cascade_list']
         if new_state == True:
             for opt in self.cf_dat.opt_dict.keys():
@@ -518,8 +518,8 @@ class InstConfigManager:
                     self.opt_lw.button_dict[opt].set_state(True)
 
         DBG.msg(self.cf_msg_index,
-            'InstConfigManager:cf_statechange({0},{1},{2}),cascade={3}'.format(
-              cfg_id, new_state, udat, cascade))
+            'InstConfigManager:cf_statechange({0},{1}):cascade={2}'.format(
+                cfg_id, new_state, cascade))
         self.cf_msg_index = (self.cf_msg_index - 7) % 2 + 8
         return