i. Thanks for your answer.

After I wrote this I found that the portal is now in app.php

I went there and everything looks fine.

Two questions if I may ask.

a) The last time I had portal with a different layout. Instead of the list of posts in a board, I had post themselves (with images and ...

Your Portal Version: 2.1.0
Your phpBB Type: Standard phpBB3
MODs installed: No
Your knowledge: Basic Knowledge
Boardlink: http://www.substeam.net/f/

PHP Version: 5.3.27
MySQL Version: 5.1.73-cll

What have you done before the problem was there?
I installed phpbb 3.1.6 and is working fine ...