I’m also very interested in any suggestions on this. I have a similar problem, only I’m trying to sort by _product_attributes. It seems like the orderby meta_value_num is not producing any result at all. I’ve tried a number of different settings, even the one provided by WooDocs ($args[‘orderby’] = ‘meta_value_num’; $args[‘order’] = ‘desc’; $args[‘meta_key’] = ‘_price’;), and nothing! Getting me kind of frustrated.
Anyone have a clue on what’s going on?