beams

[James E. Bailey]

When it rains, it pours, This is the most minimal example I could  
extract. The output has the cross staff beams horribly, horribly  
wrong. I've never seen this kind of problem before, and unlike most of  
my problems, I really can't just ignore this one.
\include "deutsch.ly"
#(ly:set-option 'point-and-click #f)
vone = {\voiceOne \slurUp \tieUp \phrasingSlurUp}
vtwo = {\voiceTwo \slurDown \tieDown \phrasingSlurDown}
vnull = {\oneVoice \slurNeutral \tieNeutral \phrasingSlurDown}
csu = {\change Staff = RH}
csd = {\change Staff = LH}
global = {\time 6/8 \key es \major \override Fingering #'avoid-slur =  
#'inside }

RH = \relative b' {
   <<
      \relative as'' {
         \vnull s8 r8 r16 <as f as,>\( <b g b,>8 s4   | %123
         s4 r16 <as f as,> <g es g,>4~ <g es g,>16 <as f as,>\)   |  
%124
      } \\ \relative g''' {
         \vtwo
         g8 s4 s8 r16 g,, b es   | %123
         g16 es b g \csd \vnull  es_( b es, b'-1 es,-2 b es-1 b)  |  
%124
      }
   >>
   \vone <b, g' b>4\( s8 s4 r16 <as f' as>   | %125
   <g es' g>4~ <g es' g>16 <as f' as> <b g' b>4\) es,16~ g~    | %126
}

LH = \relative es{ \clef bass
   es,16( b' es b es b' es, b' es) r b,8( | %123
   es8) r r s4.   | %124
   <<
      \relative es, {
         \vnull es16 b' es \csu g' b es g es b g \csd \vnull es\( b   
| %125
         es,16 b'-1 es, b es-1 b es, b'-5 es g\) r8
      } \\ \relative b ,{
         s4 \vnull b8( es) r s8  | %125
         s2.
      }
   >>
}
\score {
   \new PianoStaff
   <<
      \new Staff = "RH" <<\global \RH>>
      \new Staff = "LH" <<\global \LH>>
   >>
}