I am logged in as an administrator. This was originally reported yesterday evening by a student, as well. This only appears to be happening with one forum in the course. The other forum in the Topic is working fine.
When I read any of the posts, I cannot read the replies, instead I see this:
Subject (hidden)
This post cannot be viewed by you, probably because you have not posted in the discussion or the maximum editing time hasn't passed yet.
I compared settings for the forum that worked and this one that does not. The settings all appear to be the same. No groups, no restrictions. Any ideas? This is really urgent as it is a current forum in a course that is winding down in a few weeks.