TinyMCE in Custom Metabox not loaded after upgrading from WP 3.1.4 to WP 3.2

Found the solution. I’ll put it here in case anyone stumbles on the same problem. According to here, this code helped me solve my problem: 

add_action("admin_head","myplugin_load_tiny_mce");

function myplugin_load_tiny_mce() {

wp_tiny_mce( false ); // true gives you a stripped down version of the editor

}

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