[bug] Wierd spacing and MetronomeMark in lilypond-book

[Graham Percival]

I've managed to get the MetronomeMark to separate the stem from the
notehead:
 |
 |
 |

O

In addition, there's a huge space underneath the first staff line.  Is
the MetronomeMark #'padding property being applied underneath
the staff line?  (instead of between the Mark and the staff line)


\documentclass[letterpaper]{article}
\begin{document}
Title, Composer, Header stuff.

\begin{lilypond}
\score {
  \relative c'''{
    \tempo 4=80
    \repeat unfold 6 {c4 c c c  c c c c  c c c c  c c c c \break }
  }
  \paper {
    \context { \Score \override MetronomeMark #'padding = #16.0 }
  }
}
\end{lilypond}
\end{document}