Titling problems

[Alex Klein]

Hi guys,
first of all, great job on lilypond. I first tried it about two months 
ago and now I'm using it for pretty much all of my notation stuff. I'm 
currently using 2.0.3 which came with the recent Suse 9.1, but there are 
some improvements in 2.3.3 which make me think about switching to it 
(for example the Rehearsal marks do no longer collide with the bar 
numbers). But I have one main problem:

The titling in 2.3.3 does not seem to work correct. If I use

[...]

\header {
    \include "header.ly"
    filename = "violin1.ly"
    instrument = "Violin I"
    head = "Violin I"
    piece = "Allegro"
}

% 1st movement
\score {
  \notes {s1}
}

% 2nd movement
\score {
  \notes {s1}
  \header {
     piece = "Adagio"
  }
}

% 3rd movement
\score {

    \notes {s1}
    \header {
        piece = "Allegro con foco"
    }
}

The piece text is printed twice. If I enclose the scores with a \book{ 
}, the piece only prints once but it is always exactely the piece text 
from the header outside the book block. I even had some configurations 
where there was no titling output at all.
What is the correct way to set for example a duo consisting of 3 movements?
By the way, why did you change the 2.0 type composer text to this italic 
stuff in 2.3? I think the previous looked much better.
Cheers

Alex