I created the absolute simplest child theme: a child theme of the standard WP 3.5 theme Twenty Twelve. In Twenty Twelve the parent, and in other themes I've tried, Meta Slider works fine. But in making the simplest possible child theme of Twenty Twelve, literally a blank style.css (other than the requisite minimums in the style.css to make a child), and once the child theme is activated, the Meta Slider galleries no longer appear (though the navigation icons do).
Clearly a bug here. Any ideas?