First off, great plugin! It's super useful for anyone who wants to extend the options for NextGen gallery.
Minor issue with the new version though. During the update process, the field_value column of TEXT field is converted to a VARCHAR 255 and loses the field data if it is longer than 255.
This line in particular is the issue, line 103:
$wpdb->query('ALTER TABLE '.$table_name.' MODIFY field_value varchar(255) CHARSET utf8;');