below few tips and attempts to do:
- if you are working on subtheme, copy node.tpl.php from parent theme to the folder under subtheme (mandatory in drupal 6 themes).
- try to check if the node-taxonomy suggestions is correctly added in object $node. var_dump($node) inside the main node.tpl.php and check if is present.
- last tips: check the permission of the file tpl, maybe is not readable from the web server.