On 7 January 2012 23:47, Romain BEHAR <[email protected]> wrote:
>
> %
> % Adding a grace at the beginning of a piano staff repeats time value
> % The following example displays: treble, 3/4, grace note, 3/4 again, c''
> %

Please read the notation reference, NR 1.2.6 Special rhythmic concerns
 > Grace notes > "Known issues and warnings"

  Grace note synchronization can also lead to surprises. Staff notation,
  such as key signatures, bar lines, etc., are also synchronized.
  Take care when you mix staves with grace notes and staves without.
  This can be remedied by inserting grace skips of the corresponding
  durations in the other staves.

http://lilypond.org/doc/v2.15/Documentation/notation/special-rhythmic-concerns.html#grace-notes

In your case

  \new PianoStaff <<
    \new Staff {
      \time 3/4
      \grace d''8 c''
    }
    \new Staff {
      \time 3/4
      \grace s8 r4
    }
  >>

Grace synchronization is tracked as issue #34
http://code.google.com/p/lilypond/issues/detail?id=34

Cheers,
Xavier

-- 
Xavier Scheuer <[email protected]>

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