I'm wanting to resolve this quickly, but right now my site (hosted via hostgator) is using WP 3.2.1 and the Easy Gravatars plugin (v1.3). In a comment stream, an initial comment appears normally. However, replies to a specific comment (e.g. using the "Reply" button) result in a situation wherein the Gravatar appears over top of the username, date posted, and some of the first line of the comment.
If you're curious what exactly I mean, or want to see, check out this comment stream. It's the same way on all other posts.