Although removing the lines you mention in your answer is OK and would get you the results you're expecting, it is not advisable to change any file in the qa-include directory. You can avoid this by modifying your qa-theme.php file by adding this function:
function post_meta_what($post, $class) { }
This way, when v1.7 is ready you will be able to safely upgrade and you know if something doesn't work the issue is only in your qa-theme.php fie :)