One aspect that complicates things is that there are four different
lilylib files that Python can consider to import:
.../usr/share/lilypond/current/python/lilylib.py
.../usr/share/lilypond/current/python/lilylib.pyc
.../usr/bin/lilylib.py
.../usr/bin/lilylib.pyc
When experimenting with the 2.8.
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[
