2.6.5 and "adding reverse spring" error

[R. D. Davis]

Hi,

This afternoon, I upgraded from 2.6.0 to 2.6.5 (from source code) in
an attempt to stop getting quite a few of the following errors:

  programming error: adding reverse spring, setting to unit
  continuing, cross fingers

In the Lilypond output, after the first group of staffs, the notes begin
close to the clefs, appearing where there should be space for the time
signature.

After the upgrade, which I read would resolve this problem, the errors
are still occurring.  If I remove one of the instruments, so that
there are only five in the score, the problem goes away.  At the
beginning of the source file, I did use:

\paper {
        #(set-paper-size "letter")
       }

Thanks for all of your work with Lilypond and for any help that you
can kindly provide with this!  Hopefully there's an easy way to
correct this problem.  

Best wishes for a joyful, peaceful, healthy and prosperous New Year!

Robert

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