Index: js/privacy_status_dialog.js
===================================================================
@@ -90,6 +90,12 @@
   // hidden element in the form.
   var privacyStatus = $('input[name="cck_private_fields['+ fieldName +']"]', context).val();
 
+  var options = $('input[name="cck-private-fields-dialog-status-options"]');
+
+  // uncheck all radio buttons
+  for (var i=0; i<options.length; i++)
+    options[i].checked = false;
+
   // Set the privacy status in the dialog form element.
   $('input[name="cck-private-fields-dialog-status-options"][value='+ privacyStatus +']', $dialogContainer).attr('checked', 'checked');