Okay, weird issue. I installed the plugin and copied the code into a pafe, and voila! seems to work great!
However, when I go to tweak some of the settings, I'm getting an error:
Under "Primary Lightbox Settings", i change the width (to, say, 700px), and click the "Save All Settings", all I get is the "500 Server Error" message.
Does the same thing no matter what other part I change. Does the same thing in the "Inline Lightbox Settings" panel.