> -----Original Message-----
> From: Daniel Rosen
> Sent: Saturday, June 13, 2015 2:22 PM
> To: 'Thomas Morley'
> Cc: [email protected]
> Subject: RE: "Assertion failed!" errors
> 
> Changing #'Stem to #'NoteHead allows the code to compile error-free
> (thanks—not sure why neither anyone on the user list nor I spotted that),
> but that doesn't explain why it was aborting with #'Stem, instead of
> compiling with warnings and weird-looking output as it did in 2.19.20.

I did some more tweaking, and came up with the following new tiny example, 
which brings back the "assertion failure."

\version "2.19.21"
\new Voice \with { \consists "Balloon_engraver" } {
  \balloonGrobText #'NoteHead #'(0 . 6) \markup { "I'm a NoteHead" }
  g1
}
\layout {
  \context {
    \Staff
    \remove "Time_signature_engraver"
  }
}

So the error appears have something to do with the removal of the 
Time_signature_engraver. 
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