Fixed it here by editing the shortcodes.php file under Nextgen-Gallery\lib.
Change the ‘convert the old shortcode’ section near the top of the file to show the three lines below instead of just the the_content filter:
// convert the old shortcode
add_filter(‘the_excerpt’, ‘do_shortcode’, 11);
add_filter(‘the_content’, array(&$this, ‘convert_shortcode’));
add_filter(‘the_excerpt’, array(&$this, ‘convert_shortcode’));