Hello! Partly due to the upcoming ConTeXt meeting I updated my ConTeXt, although with the --current option for latest stable. Most of my files compile fine and there don't seem to be any problems. However, the big beast fails right after loading env-fonts-23 (attached) and it seems to be a problem connected to the Simplefonts module. This is what the log says: ----- fonts > preloading latin modern fonts (second stage) fonts > 'fallback modern-designsize rm 12pt' is loaded open source > level 3, order 4, name '../../env-fonts-23.tex' modules > 'simplefonts' is loaded open source > level 4, order 5, name 'C:/context/tex/texmf-modules/tex/context/third/simplefonts/t-simplefonts.mkiv' loading > ConTeXt User Module / Simplefonts resolvers > lua > loading file 'C:/context/tex/texmf-modules/tex/context/third/simplefonts/t-simplefonts.lua' succeeded tex error > tex error on line 802 in file C:/context/tex/texmf-modules/tex/context/third/simplefonts/t-simplefonts.mkiv: ! Undefined control sequence \simplefonts@fontfeature ...\normalexpanded {\@NX \definefontfeature [#1#2\s... \syst_helpers_comma_list_step ...\v!mainfont }{#1} \ctxlua {thirddata.simplef... \17>>2 #1,->\syst_helpers_comma_list_step {#1} \syst_helpers_do_process_comma... \relax regular, italic,slanted,bold,bolditalic,boldslanted,caps, italiccaps,slan \syst_helpers_do_process_comma_list ...m_gobble #1 ,]\relax \global \advance ... \simplefonts@definetextfont ...rocesscommacommand \ifx \currenttypeface \v!s... ... l.802 \setsansfont [Latin Modern Sans] 792 \c!smallcapsfeatures=\v!smallcaps, 793 \c!mode=\v!node, 794 \c!force=\v!yes, 795 \c!check=\v!no, 796 \c!expansion=\v!no, 797 \c!protrusion=\v!no] 798 799 %D Default fonts 800 801 \setmainfont [Latin Modern Roman] 802 >> \setsansfont [Latin Modern Sans] 803 \setmonofont [Latin Modern Mono][\s!features=\s!none] 804 \setmathfont [Latin Modern Math] 805 \sethandwritingfont [Latin Modern Roman] % neither handwritten nor calligraphic are available 806 \setcalligraphicfont[Latin Modern Roman] % for Latin Modern but I need a default font for them 807 808 \!!donesimplefontstrue 809 810 \stopmodule 811 812 \protect \endinput ? ----- My understanding of the font mechanics is flaky (to put it mildly), so I don't know if the problem is in my font definitions or if I've actually found a bug (unlikely, but you never know). What is weird is that the almost similar env-fonts-pr33.tex works without complaints. I'm running standalone ConTeXt on a 64-bit Windows10 machine, if that makes any difference. The ConTeXt version is 2018.08.28 17:21 MKIV beta. I don't need the non-working file right now. But it has to compile by the end of next week or I'll be in trouble... Thanks, Mari