Using this plugin to display galleries, and it's working great on my desktop (in both Chrome & FF). I remember checking on my iPhone a few weeks ago, and it was working well there, too.
Now, the lightbox isn't activating on my phone. It just seems to load the image file -- what WP calls the media file, I guess.
Between it working and not working, I believe is when I upgraded WP to 3.6.
Overall, a great, simple plug-in. Not sure if this is user error, or related to the WP upgrade.