rorybe

For anyone who stumbles upon this through search:

Problem was unrelated to the Relevanssi plugin as far as I can tell, however I solved it using info gleaned from here.

Try to drop that in your functions.php file:

function filter_query_for_search( $query ) {
    if ( isset( $query['s'] ) ) {
        $query['post_type'] = array('forum', 'topic', 'reply', 'any');
    }
    return $query;
}

add_filter('request', 'filter_query_for_search', 1);

Thanks for that, I didn’t think of just trying another theme, but I have at least now established that that’s not the problem either (am getting the same problem with a clean default theme).

The problem doesn’t exist in the php itself, so much be getting added at some point when the server renders the page.

Will keep searching, and will update with anything I discover.