OK, so I've been reading this fic since it started about a month ago and had access to be able to comment if needed. All of a sudden, I wasn't able to comment. At first, no one commented for the next few updates, so I thought they just changed it for everyone, but the latest chapter's had other people commenting. I've tried sending them a Tweet but no response or upset comment in my inbox so I just don't know what their issue is. Any advice about what to do from here?

EDIT: Thanks for the responses, I'm really enjoying the fic in question, but it's almost finished (7/10 planned chapters are up) so the problem should resolve itself when it's finished.