If you experiment a bit, you will notice that the time signature change
has nothing to do with it. Rather, it's the preceding chord tremolo that
triggers the bug, as the following simplified example illustrates:

\version "2.8.4.1"
\relative c' {
\repeat "tremolo" 16 { a32 c }
\acciaccatura { c16[ d] }
e1
}

It seems that the bug has been solved in the latest development version
(which unfortunately is likely to have other bugs instead).
I'm not sure how easy it is to back-port the fix to the next 2.8.x release,
but I'm forwarding this email to bug-lilypond anyway.

  /Mats


Palmer, Ralph wrote:

Hi -
I'm running 2.8.4.1 under Windows XP SP 2.

I'm having trouble getting the beaming to work correctly on an
acciaccatura. I have a preceding measure with tremolos, then a time
change. In the log, I get the following message:

Interpreting music... programming error: Stem already has beam
continuing, cross fingers
programming error: Stem already has beam
continuing, cross fingers

If I run the measure with the acciaccatura without the preceding
measure, it looks correct. I've tried using appoggiatura, as well, with
the same results. Here are two snippets, one with the problem, and one
without either the preceding measure or the problem:

Snippet bad:
%%%%%%%%%%%%%%%%%%%%%%
\version "2.8.4.1"
Music = {
     \clef treble
     \key c \major
     \time 3/4

        \repeat "tremolo" 4 { aes32( ^\markup \column {{ "di nuovo" }
{misterioso} } c'32) } \repeat "tremolo" 4 { b32( dis'32) } \repeat
"tremolo" 4 { bes32( dis'32) } \breathe |

        \time 2/4
        \acciaccatura { cis''16[ dis''] } eis''16 gis'' eis'' dis''~
dis'' d'' cis''!8 \breathe |


}

\score {
      \Music
      }
%%%%%%%%%%%%%%%%%%%%%%%%%%

Snippet good:
%%%%%%%%%%%%%%%%%%%%%%%%%%%
\version "2.8.4.1"
Music = {
     \clef treble
     \key c \major
     \time 2/4

        \acciaccatura { cis''16[ dis''] } eis''16 gis'' eis'' dis''~
dis'' d'' cis''!8 \breathe |


}

\score {
      \Music
      }
%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Can anyone tell what's happening, and/or how I can get the desired
output?

Thanks again for all the help this list has been,

Ralph
+++++++++++++++++++++++++
Ralph Palmer
Energy/Administrative Coordinator
Keene State College
Keene, NH 03435-2502
Phone: 603-358-2230
Cell: 603-209-2903
Fax: 603-358-2456
[EMAIL PROTECTED]



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--
=============================================
        Mats Bengtsson
        Signal Processing
        Signals, Sensors and Systems
        Royal Institute of Technology
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
       Fax:   (+46) 8 790 7260
        Email: [EMAIL PROTECTED]
        WWW: http://www.s3.kth.se/~mabe
=============================================



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