First off, I'm not exactly sure where to post this.
Since the minor rework of the boards whenever I click the _REPLY_ - Button, instead of directly replying to the person it creates a separate comment. This also happens to users who are trying to reply to my comments. So neither of us are getting notifications when we've been responded to, which makes a discussion rather difficult.
Edit: This seems to be an issue when responses have been going back and forth for a while and the list of them is getting quite long.