Version 3.1.8 is a bug fix release, and well recommended if you use WPML, BBPress or category exclusions or restrictions.
- Category restriction and exclusion and couple of other category-related settings didn’t work properly.
- Support for Polylang broke the support for WPML. That is now fixed.
- One deprecated $wpdb->escape() was still left; it’s gone now.
- Shortcode layerslider was causing problems with Relevanssi; Relevanssi now disables it before building excerpts.
- Relevanssi won’t break BBPress search anymore.
- If Relevanssi Premium is installed, deleting Relevanssi will not remove the databases and the options.