When installing Hierarchy on my local machine with WP_DEBUG set to true I get the following error:
Notice: Undefined index: post in /Users/tim/Documents/HTDOCS/wp-content/plugins/hierarchy/hierarchy.php on line 425
I’m not PHP expert, but it seems to be something wrong with the way you are detecting WordPress 3.4 and adjusting the data structure here:
$struct = $wp_rewrite->extra_permastructs[$post_type]['struct'];
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