I've found a bug. Trying to perform "Delete General options and restore default settings" (big blue button on the bottom) I got
Fatal error: Call to undefined method MLAOptions::mla_post_mime_types_option_handler() in /var/www/wpuxssdev/data/www/hoot.smartwpdev.com/wp-content/plugins/media-library-assistant/includes/class-mla-settings.php on line 2939
Not sure, if it doesn't work for me only or for anyone else as well.
Thanks in advance for fixing this.