Dear Stefan,
I eventually tried the latest version from the CVS. 
And it is odd because like when I tried version 2.5.3, it is like it ignores
the passwd file. I guess I must have a problem in my cfg file.
So I can't really test if 2.5.3 or 2.5.4 have the same problem.

Right now I'm still using 2.5.2 which works fine, if i log out and click on
the logbook tab. I get the page which ask for the username and password. The
thing is I don't get returned to the username/password when I hit log out. I
arrive in the state you can see in the unlogged.jpg.
From here if can go into all the logbooks as long as I don't hit the
logbooks tab and worse I can access to all the config files.

Is there something really badly configured in my config file ? I guess it is
not supposed to work that way.

Thank you,

Alexandre