\acciaccatura in first measure makes odd staff

[Doug Asherman]

Hello:

I'm having a problem with the \acciaccatura when used as the first note 
of a measure in a PianoStaff. With the acciaccatura in, I get a treble 
staff that has a treble clef, key signature, time signature, the 
acciaccatura, a time signature, then the start of the regular notes.

In the bass staff, I get a treble clef, time signature, bass clef, key 
signature, then the start of the notes.

The lilypond source is attached below. Even comments like "You're doing 
something stupid -- check out http://www.etc.etc...."; would be welcome. 
Well, as long as they're relevant.

Thanks for any help.

Doug


Global = \notes { \time 2/4 \key g \major }

upperOne =
  \notes \relative c'' {
  \voiceOne
  \partial 8
  %% PROBLEM: The \acciaccatura seems to mess things up
  %\acciaccatura a'32 \stemDown g16\mf( fis32 g)
  % comment out the line above, uncomment the following line, no problem
  \stemDown g'16\mf( fis32 g)
}

lowerOne =
  \notes \relative c {
  \voiceOne
  \partial 8
  r8
}

% set up the whole piano context
piano = \context PianoStaff <<
          \new Staff <<
          \Global
          \clef treble
           \context Voice = one \upperOne
          >>
          \new Staff <<
            \Global
            \clef bass
            \context Voice = one \lowerOne
          >>
        >>

\score {
  \notes {
    \piano
  }
  \paper {}
}