I've done quite a bit of looking at this, and think it's to do with the use of 
\grace at the start of the music.  Here's an illustrative smaller version that 
displays the same problem:

\version "2.16.2"

  harprh = \relative c' {
    \clef treble
    \grace { s16 } R1*4 |
    \break
    R1*4
  }

  harplh = \relative c' {
    \clef bass 
    \grace { s16 } R1*4 |
    \break
    R1*4
  }

  \score { <<
    \new PianoStaff = "harp" <<
      \set PianoStaff.instrumentName = "InstName"
      \set PianoStaff.shortInstrumentName = "Short"
      \new Staff = "rh" { \harprh }
      \new Staff = "lh" { \harplh }
    >>
    >>
  }


--
Phil Holmes


  ----- Original Message ----- 
  From: 胡海鹏 - Hu Haipeng 
  To: lilypond-user 
  Sent: Friday, May 31, 2013 12:12 PM
  Subject: strange problem with instrument name


  Hello,
    I just finished the first movement of my orchestral suite. All are good, 
except the instrument name of Harp. I checked other scores, which contain the 
same setup but with different orchestrations, but in this one, the instrument 
name of harp is not displayed, only short names are given. What's wrong?
  TIA

  Regards
  Haipeng











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