I have a couple of things...
1. message stack/notice is not showing up when customer is not logged in and tries to write a review with Enable product reviews by guests? set to 0.
2. I had previously added reply to reviews functionality to my 1.3.9h store. I am trying to add it to this with some problems. I am hoping that someone notices and can correct my mistake/s and/or omissions.
All I have been getting is a blank page with no right side boxes, and no myDebug out put either...??? 
here is a list of my mods...
SQL
Code:
ALTER TABLE `reviews_description`
ADD `reviews_reply_text` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL;
modules/pages/product_reviews_info/header_php.php:
Code:
// addition of reviews_reply_text below
$review_info_query = "SELECT rd.reviews_text, r.reviews_rating, r.reviews_id, r.customers_name, rd.reviews_reply_text,
r.date_added, r.reviews_read, p.products_id, p.products_price,
p.products_tax_class_id, p.products_image, p.products_model, pd.products_name
FROM " . TABLE_REVIEWS . " r, " . TABLE_REVIEWS_DESCRIPTION . " rd, " . TABLE_PRODUCTS . " p, " . TABLE_PRODUCTS_DESCRIPTION . " pd
WHERE r.reviews_id = :reviewsID
AND r.reviews_id = rd.reviews_id
AND rd.languages_id = :languagesID
AND r.products_id = p.products_id
AND p.products_status = '1'
AND p.products_id = pd.products_id
AND pd.language_id = :languagesID " . $review_status;
$review_info_query = $db->bindVars($review_info_query, ':reviewsID', $_GET['reviews_id'], 'integer');
$review_info_query = $db->bindVars($review_info_query, ':languagesID', $_SESSION['languages_id'], 'integer');
$review_info = $db->Execute($review_info_query);
$products_price = zen_get_products_display_price($review_info->fields['products_id']);
$products_name = $review_info->fields['products_name'];
//addition of reviews reply
if ($review_info->fields['reviews_reply_text']) != '') {
$reviews_reply_text = $review_info->fields['reviews_reply_text'];
}
if ($review_info->fields['products_model'] != '') {
$products_model = '<br /><span class="smallText">[' . $review_info->fields['products_model'] . ']</span>';
} else {
$products_model = '';
}
languages/english/YOUR_TEMPLATE/product_reviews_info.php
Code:
define('TEXT_OF_5_STARS', '');
define('TEXT_PRODUCT_INFO', 'Take Me to the Details');
define('TEXT_REVIEW_ADDITIONAL', 'Read More Reviews');
//addition of review reply heading
define('TEXT_REVIEW_REPLY_HEADING','<strong>' . STORE_NAME . ''s Reply:</strong>');
templates/YOUR_TEMPLATE/templates/tpl_product_reviews_info_default.php
Code:
ADDED TO THE BOTTOM, JUST BEFORE THE LAST </div>
<!--bof Reviews Reply -->
<br class="clearBoth"/>
<?php
if ($reviews_reply_text) != ''){
?>
<div id="reviewsInfoDefaultMainContent" class="content"><?php echo TEXT_REVIEW_REPLY_HEADING; ?><br /><?php echo zen_break_string(nl2br(zen_output_string_protected(stripslashes($review_info->fields['reviews_reply_text']))), 60, '-<br />'); ?></div>
<?php } ?>
<!--eof Reviews Reply-->
</div>
My hope is to get this working properly, and then add the ability to write your reply on the "edit review" page in the admin. I am currently just writing the reply's through phpMyAdmin and then approving the review there.
The working 1.3.9 version of this is here
Non working 1.5.1 is here - (this store is not yet public!)
Bookmarks