gistfile1.txt

/**
 * INSTALLATION: this code should be pasted into your theme's functions.php file.
 *
 * Compatibility: Flex Slider.
 */
function metaslider_variable_heights($options, $slider_id, $settings) {
    $options['start'][] = "setTimeout( function() { slider.trigger('resize') } , 500 );";
    return $options;
}
add_filter('metaslider_flex_slider_parameters', 'metaslider_variable_heights', 11, 3);