I'm trying to use new feature Custom Reply-to introduced in CiviCRM 4.6 (4.6.8 now installed). I go into Admin/CiviMail/Mailer Setting and click the Yes radio button, then save. A Reply-to field now appears on the message preparation form, and the feature appears to work fine. However, when I go back to Admin/CiviMail/Mailer Settings the Custom Reply-to radio buttons are both blank (unselected), with neither Yes or No selected. This same issue exists in both my test and production systems. The sandbox does not have this issue so there is probably something amiss in my database(s). Which table is supposed to store this setting, and can I best repair the problem?