Ok, as Jeremy said, the .js files are the problem. But there are TWO problems. One is the file structure. You had it like this.
Unzip.
localdir/glassy/glass/glassy.php
localdir/glassy/glass/glassy/js/glassy.js
Really, not a big deal – except that you were not calling the js.
I moved all the files to just plain ol’ /glassy/ and edited my glassy.php
<script type="text/javascript" src="https://www.studio646.com/wp-content/plugins/glassy/js/mootools.js"></script>
<script type="text/javascript" src="https://www.studio646.com/wp-content/plugins/glassy/js/glassy.js"></script>
While this only fixes it for me, at least then people can see what I did.
Now the file structure is like this:
wp-content/plugins/glassy
wp-content/plugins/glassy/js
It works decently. Needs a bit more work for customization. And why, may I ask, does it force the img to center? I’m sure it’s something in the glassy.js and easy to edit if you find it – but kind of weird to force it.
Overall a nice plug in and I’ll be happy to use it.