Stem missing from note

[David Rugger]

The first note in the second measure (the dotted quarter b) is missing a 
stem. Operating system is Windows XP.

\version "2.8.7"
solopart = {
  \key g \major
  \relative c'' {
   \time 4/4
     <<
        {
           d4.( b8) a4 b
           g1
        }
        {
           f4. d8 cis4\( c
           \stemDown
           b4.( a8 g2)\)
        }
     >>
  }
}
\score {
  {
     \clef treble
     \solopart
  }
}