RehearsalMark & MetronomeMark, again

[Kieren MacMillan]

Hi all,

I just can't seem to get RM & MM to work well together. I've got a ScoreMarks 
context, with the following overrides (amongst others):

\context {
  \ScoreMarks
  \override MetronomeMark #'extra-spacing-width = #'(-0.5 . 0.5)
  \override MetronomeMark #'Y-offset = #3.0
  \override MetronomeMark #'outside-staff-padding = #0.8
  \override MetronomeMark #'non-break-align-symbols = #'(paper-column-interface)
  \override RehearsalMark #'break-align-symbols = #'(staff-bar key-signature 
clef)
  \override RehearsalMark #'extra-spacing-width = #'(-0.5 . 0.5)
  \override RehearsalMark #'Y-offset = #3.0
  \override RehearsalMark #'outside-staff-padding = #0.8
}

I took this from the Google Code issue page 
<http://code.google.com/p/lilypond/issues/detail?id=3279>, because I want my 
parts to behave "as expected" — and, as I understand it, that's what that 
thread was attempting to do.

Unfortunately, in almost all of my mark+tempo pairings (in the full score, at 
least), the mark pushes the tempo marking vertically, not horizontally (as 
desired).

What am I doing wrong?

Thanks,
Kieren.