[TYPO3-ttnews] Impossible to select the categories to display

[Julien P.]

Hi,

I have an issue with categories. I have created a page, and I would like 
some news to be displayed in this page according to categories. So I select 
in drop down box "show items with selected categories (OR)", in the next 
field I select the categories I want, but when I save the news plugin page 
the categories I selected disappeared from the box, and so it does not work.

Why?

Thanks