re: WP 3.5.1, Twenty Twelve, Jetpack 2.1.2, Carousel and Tiled Galleries activated..
Updated today to 2.1.2, but I seem to have lost the Slideshow type choice in the Media Gallery. I only see: Default, Tiles, Square Tiles, Circles. Anybody else lose their Slideshow option? My slideshow reverted back to a default gallery?