Looking at that last post, it appears to be related more to the styles than the plugin. What I’m seeing is this:
* Album images styled using “float: left” so they stack nicely next to each other
* An image with a two-line caption consumes more vertical space than an image with a one-line caption
* Because of the differences in object height due to differing caption lengths, the browser floats the next image after a two-line caption in the next available vertical spot – in your example this is the 3rd column because the 2nd column has a two-line caption.
Now, with this problem in mind, I’m not certain how this plugin could be modified to solve this issue. The “class” and “style” options in the preferences are intended to help assist with any tweaking you need to make, so in your example you might be able to set a static height for the caption box.
If an additional class/style option needs to be added specifically for captions, I could probably do that, and from there you could possibly set a static height for every caption box. Let me know your thoughts.