Disappearing dynamics

[Andrew Bernard]

Hi All,

I apologize for the seeming lunacy of this post! I am using lilypond
2.19.82 on Ubuntu 18.10. I am currently engraving a string quarter. Only
seven or eight pages in, I have started added in the dynamics and I find
they just disappear - they don't show. I am simply adding dynamics to the
notes, not in a separate Dynamics context. I am utterly unable to provide
an MWE to support this, as it only happens in the context of my full work,
the complete apparatus of which is very large. I am unable to binary chop
things to see where the error could come from, it's just impractical. The
worst part is that some dynamics show, and they only show after repeated
compile after compile. This latter point is what makes me think there may
be some very subtle memory related bug involved here.

Has anybody heard of this crazy behaviour? There's not a mention of such in
the lilypond user archives.

I cant figure out what to do next, except give up the engraving, which is
slightly sub-optimal.

Any suggestions would be gratefully received.

Andrew