As you have noticed already, there is a new comment system in our site. It seems that people having some problems publishing comments.

You CAN'T post a comment from the main page anymore. In order to do so, you have to go on the article's page first and then click the comment button.

e.g.
In order to post a comment in this article, click the title of the post ("New Comments System"). Then go to the end of the post and click "comments". A Peek-a-Boo form will appear and then you can post your comments.