When I installed this, it worked flawlessly. Since then, I've added other plugins (such as a modal login) and made changes to the comments template and functions.php. I have no idea if any of that is relevant, but today the comment preview simply doesn't work anymore.
I've followed all the instructions on the FAQs, right up to "Other than that, nope, I'm out of ideas." Well, I'm out of ideas, too.
Does anyone have any experience with this that might be of any help?