By the way, the fix is in the open-graph.php file. Line 49.
Change:
$tag_array = array('type' => 'name', 'value' => $k, 'content' => $v, 'context' => 'post-type_'.get_post_type() );
To:
$tag_array = array('type' => 'property', 'value' => $k, 'content' => $v, 'context' => 'post-type_'.get_post_type() );
