Frank, when a comment receives at least two ratings and the average score is below 1.0, it is automatically hidden, which also hides any replies to it (though you can retrieve your comment from your own recent comments list). Trusted users can see hidden comments, unless they have set their user preferences accordingly. Anyone can become a trusted user after enough of their comments have received high enough ratings by the community.

Thanks for re-posting.

We have met the enemy, and he is us — Pogo