Strange cross-stave beam and slur behaviour with portato

[Neil Puttock]

Hello,

The portato sign is causing some strange behaviour with both beams and slurs
when a voice crosses staves.

Unfortunately, I can't seem to replicate the beaming problem in a minimal
example, but it seems related to the following snippet where the portato
mark causes the slur to be skewed:

\version "2.11.30"
\paper { ragged-right = ##t }
lh = \change Staff = lh
rh = \change Staff = rh
\score {
    \new PianoStaff <<
    \new Staff = rh \relative { c8-_( \lh  \stemDown e[ c g]) }
    \new Staff = lh { \clef bass s4. }
    >>
}

I've attached a picture of the beaming problem in case it's useful.

Regards,
Neil

portato.PNG
Description: PNG image

beams.PNG
Description: PNG image