On 4 Jul 2023, at 23:26, Wolfgang Schuster <wolfgang.schuster.lists@gmail.com> wrote:

Gerben Wierda schrieb am 04.07.2023 um 23:17:
After erasing the font cache and regenerating LM was doing it right again.

Helvetica did not, but maybe I made a mistake in

\definefontfamily
  [helvetica]
  [ss]
  [Helvetica]
  [tf=style:Regular,
   bf=style:Bold,
   it=style:Oblique,
   bi=style:Bold Oblique]

Does it work when you remove the manual assignments to tf, it, etc. or when you use lowercase names (without spaces), e.g. "bi=boldoblique" (or "bi=bolditalic").

No and no. With th elatter it doesn't load Helvetica at all, Error shown:
selectfont      > the requested font 'Helvetica' has no files for the 'tf' alternative, Latin Modern is used instead.
mkiv lua stats  > loaded fonts: 4 files: latinmodern-math.otf, lmroman10-italic.otf, lmroman10-regular.otf, lmsans10-regular.otf

With my original it does load (but no italic):
mkiv lua stats  > loaded fonts: 4 files: helvetica.ttc, latinmodern-math.otf, lmroman10-italic.otf, lmroman10-regular.otf


Erase cache, regenerate formats, reload fonts (force) does give another (probably unrelated) error:

fonts           | names | identifying system font files with suffix 'ttf'
fonts           | names | globbing path '/Library/Fonts/**.ttf'
fonts           | names | globbing path '/System/Library/Fonts/**.ttf'
otf reader      | fatal error in file '/System/Library/Fonts/SFCompactRounded.ttf': ...-64/tex/texmf-context/tex/context/base/mkiv/font-dsp.lua:3689: attempt to index a nil value (field '?')
stack traceback:
...-64/tex/texmf-context/tex/context/base/mkiv/font-otr.lua:2344: in metamethod 'index'
...-64/tex/texmf-context/tex/context/base/mkiv/font-dsp.lua:3689: in local 'reader'
...-64/tex/texmf-context/tex/context/base/mkiv/font-otr.lua:2089: in upvalue 'readtable'