found the problem
the extension does not add the correct filename for the template...
$WA_index_1308554741097_Template = new WA_Include("../Templates{$WA_index_1308554741097_Content_Empty}/index.php");
should be
$WA_index_1308554741097_Template = new WA_Include("../Templates{$WA_index_1308554741097_Content_Empty}/index.dwt.php");