Ok, i've tried this with both Jetpack, and the forked carousel-only plugin, and neither of them are working. On the media settings page, I have the options to enable it, but all gallery images redirect to their own page. i don't have any other image-related plugins installed, and i'm just using the standard gallery shortcode.
My current plugins are:
Contact Form 7
Gallery Carousel Without JetPack
HTML Page Sitemap
Page Lists Plus
solved. i'd missed the wp_head(); in header.php