I am very happy with fireboard even if I found a bug :

I have several forum categories. Each of the categories has 2 or more sub-categories (forums).

At the beginning, the category with its two sub-cat opened to public was at the top of the page .
Below,all the other private categories.

Everything was fine until I inversed their order :
- at the top, the private categories
- at the end, the public one.

Then, the forums appeared below the footer of the page, on all thir width.