The module contains a menu entry to define ddblock/js, which in turn both has the access callback set to TRUE, and the page callback set to a function that does not exist. Therefore, going this page on any site (example.com/ddblock/js) causes a php error.

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'ddblock_select_template_ahah' not found or invalid function name in menu_execute_active_handler() (line 517 of /Users/cash/Sites/ddblock.localhost/docroot/includes/menu.inc).