Den sön 27 aug. 2023 kl 09:49 skrev Ihor Radchenko <yantar92@posteo.net>:

> Henrik Frisk <frisk.h@gmail.com> writes:
>
> >> Hmm. Did you customize `org-src-fontify-natively'?
> >>
> >
> > This is what I have:
> >
> > (setq org-confirm-babel-evaluate nil
> >       org-src-fontify-natively t
> >       org-src-tab-acts-natively t)
>
> Then, might be https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63579
> If it is, putting (defvar font-lock-reference-face nil) into your config
> should help; and, ideally, also reporting the bug to lilypond devs.
>

Yes, that did it, thanks!
/Henrik