My latest log say:
[05-Dec-2013 09:12:19 Europe/Rome] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/centoasa/public_html/includes/languages/italian/index.php:109) in /home/centoasa/public_html/includes/functions/functions_general.php on line 45

I use the default tpl_modules_specials_default.php (in the template default directory).
I've only installed:
http://www.zen-cart.com/downloads.php?do=file&id=1206
http://www.zen-cart.com/downloads.php?do=file&id=1568
maybe this?