First \book different sized PDF to second -same- \book

[Michael Scheer]

Hi Lilypond users,

any idea? I produce multiple books. It appears that the first created book does 
not respect
"StaffSize". It's all too big. Notice that in the example all is the same, 
except the output
filename.

All subsequent books are printed respecting StaffSize. I can swap them - It's 
always the
first PDF which is faulty.

Anyone see why?

% EXCERPT
\book {
  #(set-global-staff-size StaffSize)
  \score { <<  \STAFF_I >> }
}

\book {
  \bookOutputName #(format #f "~a-~a" (module-ref $defaultheader 'title) "S1")
  #(set-global-staff-size StaffSize)
  \score { <<  \STAFF_I >> }
}
% END