WP Comments not visible

First of all I want to say thanks for this wonderful theme!!! I like it very much. Most of all because I can change a lot on the theme: the width of the articles, the width of the sidebar, the height of the header, etc. Also the fact that the User’s menu folds out in different levels is a great thing!

But now I have a problem with the comments. To be clear I have to say that I use the Social Comments WordPress Plugin by Bainternet. That gives visitors the possibility to comment with WP, Google+, Facebook and Disqus. With my previous theme I had no problems with that plugin.
With Asteroid installed today I encounter a sudden problem. Leaving comments with that plugin isn’t a problem. People can leave comments and I receive an email of that comment. No problem their. But … and now it comes … when people leave a comment with WP, the comment isn’t shown. That’s very weird because the comments made with Facebook, Google+ and Disqus do appear under the article.

My question now is what can be the problem? What causes this problem and how can I make it work again?

Thanks in advance to the one who helps me out.