"Reset Ad Expiration" - Not working

Since upgrading to 6.x-2.0-alpha4, the "Reset Ad Expiration" checkbox is no longer functional. I check it and save the ad, but the date is not reset to another 8 days (my setting for the length of the ad). It still expires on the original expire date. (See image for the button I'm talking about).

I don't know if something here is causing the problem, but maybe it's in the ed_classifieds.module file around line 610?

  // calc expiration date as appropriate
  // If new ad, or user wants to reset expiration, or taxonomy was changed... recalc expiration?
  if (empty($node->expires_on) || $user_reset) {
    // it's a new ad, or the user chose to reset the expiration
    $form_state['values']['expires_on'] = $expiration; // _ed_classified_get_default_ad_duration_in_seconds();
    // _edi_wd(sprintf('Ad expiration was %d (%s), now %d (%s)', $old_expires, _edi_safe_date_fmt($old_expires), $node->expires_on, _edi_safe_date_fmt($node->expires_on)));
    // TODO: need to deal with republishing if workflow allows
    $expiration_changed = TRUE;
  }