lyric syllable alignment problem

[Nicolas Sceaux]

Hi,

I am running lilypond 1.6.0 (debian unstable package)

While moving my pieces from 1.4.x to 1.6.x, I met some troubles.
The following example shows one of them: lyric syllables are not
aligned with the first note of beam groups, as they used to be.
------------------------
\score {
    \addlyrics
    \context Staff <
        \clef treble
        \property Staff.autoBeaming = ##f
        \property Staff.automaticMelismata = ##t
        \notes { R1 c'8 [c' d'] [c' d' e'] [c' d'] c' d' e' r r2
                 c'' c'' c'' c'' c'' c'' c'' c''
                 c'' c''} >
    \context Lyrics {\lyrics{ il la -- "bro, o" gi -- "ra il" guar -- do. }}

    \paper { }
}
------------------------
ly2dvi gives the following result:
http://nicolas.sceaux.free.fr/mutopia/test-pb.png

This behaviour is not systematic: when removing the first "R1",
syllable alignment is fine:
http://nicolas.sceaux.free.fr/mutopia/test-ok.png

Maybe I simply need to upgrade ?

Thanks in advance
Nicolas