The last line in includes/modules/sideboxes/CUSTOM/information.php is
Code:
require($template->get_template_dir('tpl_information.php',DIR_WS_TEMPLATE, $current_page_base,'sideboxes'). '/tpl_information.php');
which means that tpl_information.php page needs to be included in templates/custom/sideboxes/ and it was not there. 
now if I can only get an answer to my next question - applying jqZoom to product listing pages - (posted here http://www.zen-cart.com/forum/showpo...&postcount=145)
Ajeh, you're brilliant can you help with this? i know Kobra was looking into this thread, maybe you can pull some strings? ;)