YARPP's "consider titles" and "consider bodies" relatedness criteria require your wp_posts table to use the MyISAM storage engine
, but the table seems to be using the InnoDB engine. These two options have been disabled.
To restore these features, please update your wp_posts table by executing the following SQL directive: ALTER TABLE `wp_posts` ENGINE = MyISAM; . No data will be erased by altering the table's engine, although there are performance implications.
If, despite this check, you are sure that wp_posts is using the MyISAM engine, press this magic button: