Spacing issue in 2.12.3

[Roland Lutz]

Hi,

since I upgraded from Lilypond 2.10.33 (Debian lenny) to 2.12.3 (Debian 
squeeze), any page processed by Lilypond is moved to the top of the page, 
and the two staffs of a PianoStaff are much closer than before.  This can 
be reproduced by any file; here is a minimal example showing the 
PianoStaff problem:

\version "2.10.0"
\score {
    \new PianoStaff <<
        \new Staff << \new Voice { c'4 } >>
        \new Staff << \new Voice { c'4 } >>
    >>
    \layout {
    }
}

I'm not sure whether this is intended behavior, a bug, or a 
misconfiguration on my part.

In case it isn't obvious what's wrong with the previous example, I'm 
attaching files that show the problem on a "real-world" file.

Roland

showtime-2.10-correct.pdf
Description: Adobe PDF document

showtime-2.12-bugged.pdf
Description: Adobe PDF document

showtime.ly
Description: Text document