This is what your website is requesting:
http://nancycarlson.com/wp-content/themes/pinboard/scripts/fitvids.js
This is what your website should be requesting:
http://nancycarlson.com/wp-content/themes/pinboard/scripts/jquery.fitvids.js
Based on this line in functions.php:
wp_register_script( 'fitvids', get_template_directory_uri() . '/scripts/jquery.fitvids.js', array( 'jquery' ), null );
So unless some plugin has overridden the path of the 'fitvids' handle or you have unintentionally altered that path, I don’t see why this would be happening. I also don’t see why a plugin would alter a path in the theme directory.