Choose from most used tag not working

Hello,
Thanks for this plugin, very useful!
I create a custom post type called “question” with this code in my function.php :

// function that creates the questions custom blog post with the SuperCPT plugin
function add_questions_post_type_question() {

	// we check if SuperCPT is installed
	if ( ! class_exists( 'Super_Custom_Post_Type' ) )
        return;

    // creation of a new SuperCPT object for the questions
	$question = new Super_Custom_Post_Type( 'question' );

	// we set the icon for the custom question blog post
	$question->set_icon( 'question' );

	// Taxonomy test, should be like tags
    $tax_tags = new Super_Custom_Taxonomy( 'Question Tag' );

    // Taxonomy test, should be like categories
    //$tax_cats = new Super_Custom_Taxonomy( 'tax-cat', 'Tax Cat', 'Tax Cats', 'category' );
    $tax_cats = new Super_Custom_Taxonomy( 'tax-cat', 'Category', 'Categories', 'category' );

    // Connect both of the above taxonomies with the post type
    connect_types_and_taxes( $question, array( $tax_tags, $tax_cats ) );

    // Add a meta box with every field type
    $question->add_meta_box( array(
        'id'      => 'Question informations',
        'context' => 'normal',
        'fields'  => array(
            'Author'         => array( 'type' => 'select',   'options' => array( 1 => 'Name 1', 2 => 'Name 2', 3 => 'Name 3', 4 => 'Name 4', 5 => 'Name 5' ) ),
            'Other Author (if author is not listed above)'        => array(),
            'Date'           => array()
        )
    ) );
}

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When I am editing my question, I want to add tags. It works fine, but the feature choose from most used tag is not working : I can see the link in the backoffice but when I click, nothing happens. When I go in the tag list, all my tags are here.

Does anybody had the same issue ?

http://wordpress.org/plugins/super-cpt/