I really love this plugin, cause this is the only lightbox plugin which works perfectly with Jetpack Photon enabled, that so far I've found. Others either do not show image captions, or simply do not work at all.
However, I have a little issue when it comes to browsing with iPad.
This is my blog (sorry for the Japanese), and when I tap on a photo, the lightbox opens at the center of the page instead of the screen, which means I have to scroll down to see the opened image. As I swipe the image to load next one, the lightbox moves further down.
I tried both Safari and Chrome, but the behavior was the same.
This issue seen only on iPad. It's working perfectly on my Android phone and PC, regardless the browser I use.
I tried switching to another theme (default Twenty Twelve), and disabling all other plugins, with no luck.