Problem with saving translations

The current version 3.1 of WordPress SEO comes with a bug (that already has a patch waiting for review). You can fix it temporarily by putting the following code in a new file wp-content/mu-plugins/yoast-seo-fix.php:

<?php # -*- coding: utf-8 -*-

add_action( 'mlp_before_post_synchronization', function () {

    global $wpseo_admin;
    if ( ! is_a( $wpseo_admin, 'WPSEO_Admin' ) ) {
        return;
    }

    $admin_features = $wpseo_admin->get_admin_features();
    if ( ! isset( $admin_features['primary_category'] ) ) {
        return;
    }

    $primary_category = $admin_features['primary_category'];

    remove_filter( 'save_post', array( $primary_category, 'save_primary_terms' ) );

    add_action( 'mlp_after_post_synchronization', function ( $primary_category ) use ( $primary_category ) {

        add_filter( 'save_post', array( $primary_category, 'save_primary_terms' ) );
    } );
} );

If you don’t have a mu-plugins folder in wp-content, just create it.

Hope that helps,
Thorsten

This is a problem with WordPress SEO, not with MultilingualPress. So you have to keep this fix (if it’s working) until WordPress SEO publishes a new version.

Please report back if there’s anything strange even with the fix.

Thanks,
Thorsten