programming error: Rhythmic_req has no duration (Continuing; cross thumbs)

[Erik Sandberg]

I got a lot of these warnings
programming error: Rhythmic_req has no duration (Continuing; cross thumbs)
lines when I try to compile a very big piece of music (my own special 
arrangement of Bach's first violin partita, it's quite big so I don't want to 
send it to the mailing list). After 14 warnings, lily crashes.

The .ly file consists of four scores, and this crash occurs when the second 
one is compiled, but only if it is the first one first has been compiled 
before (i.e. it works fine if I comment out the first movement).

The problem has also occured earlier, and use to go away after random 
modifications. So far, it has only happened with big .lys with lots of scores 
in them.

It happens only with ly2dvi, not when using lilypond directly.

I'm using lily 1.4.10-1, from the Debian package.

I know this is a very incomplete bugreport, but I don't know what more 
information you can find relevant. What more would you like to know?

Thanks,
Erik