Just for the heck of it, I have temporarily enabled comment moderation, just in case that helps solve the problems with comments we have been experiencing lately. I doubt it will work, frankly, but it is worth trying. I am still researching possible causes of this problem.
To avoid creating many posts on this subject, I shall post all updates concerning this on this post.
UPDATE 1: And, as if by magic… success?
UPDATE 2: I am guardedly optimistic.