\betweenLilyPondSystem not spacing second from first system

[Jean-Charles]

Hi all,

I do not know if I am the only one who encounters that, but the fact is 
that running lilypond-book (2.10.25) is just driving me crazy:

I would like to collect several scores in a LPBook, including some text, 
a table of contents and pictures as well.
Everything is running fine and my makefile is correct.
But it occurs that the spacing between systems only happens after the 
second  system, as if someone forgot that there had been one just before 
belonging to the same source file.

Playing with it, I noticed that the systems get aligned according to 
their lowest point.

Thanks for helping
Jean-Charles

I have come to this minimalistic test.lytex :

\documentclass[a4paper,12pt]{book}
\usepackage[frenchb]{babel}
\usepackage[utf-8]{inputenc}
\usepackage{graphicx}
\usepackage{geometry}
\usepackage[scaled=.90]{helvet}
\usepackage{courier}
\usepackage[dvips]{thumbpdf}
\usepackage{fancyhdr}
\pagestyle{myheadings}

\geometry{a4paper,dvips,portrait,twoside,width=180mm,textheight=266.0mm,headheight=2mm,footskip=2mm,lmargin=13mm,rmargin=3mm}


\newcommand{\betweenLilyPondSystem}[1]{\newline \vspace{36pt}}
%\newcommand{\betweenLilyPondSystem}[1]{\hspace{36pt}}


\begin{document}
\begin[fragment]{lilypond}
  c'1\( e'( c'~ \break c' d) e f \break c' d) e f\)
\end{lilypond}
%\newpage

%[...]

\end{document}