Christy, I think Peg means the "unfollow" button. There is a bug, or inadvertent removal of code, with the new layout.
Once you leave a comment with the follow enabled, there is no longer an UNFOLLOW button.
I noticed that in the niche sites and now in the main site since the changeover to the new format. I was going to report this, but never got around to it.
I usually like to unfollow after I get a reply from an author, unless there's a need for followup discussions.
The only way I can unfollow now is to click the unfollow link that's provided in the notification emails.