[TYPO3-english] Group users and tt_news articles

[Sergio]

Hi list, 

I've got two group users (fe_groups) on my site, tt_news enabled and a
login box for seeing articles' content. 

Inside a tt_news article, I set up on "General options" the groups that
can see the content of the article.

The problem is: articles disappear from the LIST tt_news plugin if no
one is logged in.

I just want they to show up. I want the articles disappear only on
SINGLE plugin.

Is that possible?

Thanks in advance, 
Sergio