In taking a look at your original post, it is showing:

Text_Product_MSRP$55.00
Text_Product_SAVE$53%
Text_Product_Our$25.99

Which are the define statements in the language file.

BUT! The define statements should all be in uppercase. Like TEXT_PRODUCT_MSRP. Check that to see if it's the problem in includes/languages/english/YOUR_TEMPLATE/product_info.php, or if in the includes/functions/functions_prices.php file the defines are all uppercase such as this:

PHP Code:
$final_display_price = '<span class="smalltext1"><s>'.TEXT_PRODUCT_MSRP.$currencies->display_price($display_msrp_price, zen_get_tax_rate($product_check->fields['products_tax_class_id'])).'</s></span><br><span class="save">'.TEXT_PRODUCT_SAVE . number_format((($display_msrp_price -  $display_normal_price) / $display_msrp_price), 2, '.', '') * 100 . '% '.'</span><br><span class="norm">'.TEXT_PRODUCT_OUR.$show_special_price . $show_sale_price . $show_sale_discount.'</span>' ;