Perhaps I changed something by accident, but I cant´t find what.

When I write a new article an press the "preview" button, I don´t see my new article. Instead I see only the category with the old articles that where allready publicated.

Has somebody an idea what I changed by accident and how I can get the preview of the new, not publicated article?

I use b2evolution 2.4.6

Sorry for my bad English - the German section is not so frequented...