I’ve fixed this.
Let me know if you want more of an explanation, but here’s a hot fix:
– Go to line 348 in simple-custom-post-order.php inside this plugin’s folder.
– Replace:
if ( !isset( $wp_query->query['orderby'] ) || $wp_query->query['orderby'] == 'post_date' )
with:
if ( !isset( $wp_query->query['orderby'] ) || $wp_query->query['orderby'] == 'post_date' || $wp_query->query['orderby'] == 'date' )
