The easiest way to show current results is: [mashup query="current"]
If you tried that and it’s not working, perhaps you can provide a sample URL? Email me with the contact form if you don’t want to post it here.
As for the search query, it’s hard to tell if there’s an issue with the code or something else. What happens if you simplify it to use a fixed query that you know has some results? For example, if you know the term ‘apple’ has results, try: <?php echo do_shortcode('[mashup query="post_type=any&posts_per_page=-1&s=apple"]'); ?>