Is this what’s causing the K2 theme I’m using to present a blank page a few moments after I post a comment:

setTimeout(function() {
    jQuery('#commentform :input').removeAttr('disabled');
    jQuery('#commentformbox').slideDown();
}, 15000);

From k2/js/k2.comments.js.php

UPDATE November 20, 2007: I have turned off the live commenting features of K2 for now.