Remove WordPress Version does Not work anymore in WP 3.1.2 and WP 3.1.3

The code to remove WP version number, that I added a while back to the ‘functions.php’ file (and it was working in prior Versions of WordPress) does not work anymore in WP 3.1.2 and 3.1.3:
here is the hack (added in functions.php)
//Remove all WordPress version from header + feed

function complete_version_removal() { return ''; }
add_filter('the_generator', 'complete_version_removal');

This one does not work either (added in functions.php):
//REMOVES ONLY FROM HEADER
remove_action('wp_head', 'wp_generator');

Basically the following meta is still visible in the header of the HTML source:
<meta name="generator" content="WordPress 3.1.3" />

I even tried the ‘Remove WP version everywhere’ plugin and it did not work either.
What is the solution here? Thanks.