Problems with lyrics since 1.4.10

[Nicolas Sceaux]

Hi,

Until 2 weeks ago, I was using lilypond 1.4.9 on debian woody, on
my previous computer. I had no problem with lyrics. then I changed my
machine, also using Debian, and the lilypond package was upgraded to
1.4.10. Then I got problems.

Compiling the attached file (which is a bit long, sorry) produces the
following output:

-------
cd /home/nicolas/loisir/cesare/
ly2dvi -P /home/nicolas/loisir/cesare/1-1-ces.ly
Running LilyPond...
-I /home/nicolas/loisir/cesare -H dedication -H title -H subtitle -H 
subsubtitle -H footer -H head -H composer -H arranger -H instrument -H opus -H 
piece -H metre -H meter -H poet -H texttranslator -H language -H linewidth -H 
latexpackages -H latexoptions -H latexheaders -H orientation -H pagenumber -H 
textheight -H papersize /home/nicolas/loisir/cesare/1-1-ces
GNU LilyPond 1.4.10
Now processing: `/home/nicolas/loisir/cesare/1-1-ces.ly'
Parsing...
Interpreting music...[8][16][24][32][40][48][55]
Preprocessing elements... 
Calculating column positions... 
[3][6][9][12][15][18][21][24][27][30][33][36][39][42][45][48][51][54][55]
paper output to `1-1-ces.tex'...
lilypond: ../flower/include/interval.hh:28: Real Interval_t<double>::center(): 
Assertion `!empty_b ()' failed.
error: lilypond: command exited with value 6
Traceback (most recent call last):
File "/usr/bin/ly2dvi", line 834, in ?
run_lilypond (files, outbase, dep_prefix)
File "/usr/bin/ly2dvi", line 432, in run_lilypond
system ('lilypond %s %s ' % (opts, fs))
File "/usr/bin/ly2dvi", line 234, in system
error (msg)
File "/usr/bin/ly2dvi", line 132, in error
raise _ ("Exiting ... ")
Exiting ... 

2PS finished at Sat Mar  2 18:43:28
-------

The same problem with that file seems to appear on Mandrake, also
using 1.4.10. I tried with the dev version 1.5.36 (uninstalling
1.4.10, building the 1.5.36 package and installing it), but same
result. The file compiles fine if I comment all lyrics. I am mostly
typesetting music with lyrics, so that is huge inconvient for me. 
Searching the mail archive didn't give any clue.

I have also a subsidiary question:
when I compile, say, examples/input/regression/lyric-phrasing.ly or
non-empty-text.ly, the dvi file shows the texts
printed, but when I dvips it, the ps file does not.

I am using regular debian woody packages.

Has anyone got an idea ?
Maybe I am simply baddly typesetting the scores, as it seems that all
my aria get compilation errors since I have upgraded from 1.4.9 to 1.4.10.

Regards,
Nicolas

---
a a a a g g g g g g c c c c c c c c
1 2 3 4 1 2 3 4 5 6 1 2 3 4 5 6 7 8 <--- lyrics are not always that
easy to write

1-1-ces.ly
Description: Presti omai...