I am trying to typeset some documents under tex/texmf-context/doc/context/sources with mixed results. I am using ConTeXt from TeX Live 2021, and the latest LMTX (just rsync'ed). Results vary: 1. Successful in both cases: $ /Library/TeX/texbin/mtxrun --script context --autogenerate mag-0000-mkiv.tex [...] system | total runtime: 5.074 seconds $ ~/context-osx-64/tex/texmf-osx-64/bin/mtxrun --script context --autogenerate mag-0000-mkiv.tex [... $ system | total runtime: 3.323 seconds of 3.389 seconds 2. Fatal error with TeX Live vs apparently stuck with beta: $ /Library/TeX/texbin/mtxrun --script context --autogenerate mag-1104-mkiv.tex [...] mtx-context | fatal error: return code: 256 $ ~/context-osx-64/tex/texmf-osx-64/bin/mtxrun --script context --autogenerate mag-1104-mkiv.tex [...] pages > flushing realpage 7, userpage 6, subpage 7 pages > flushing realpage 8, userpage 7, subpage 8 pages > flushing realpage 9, userpage 8, subpage 9 [Gets stuck at this point, with luametatex using 100% CPU] 3. Fatal error in both cases: $ /Library/TeX/texbin/mtxrun --script context --autogenerate mag-1102-mkiv.tex [...] mtx-context | fatal error: return code: 256 $ ~/context-osx-64/tex/texmf-osx-64/bin/mtxrun --script context --autogenerate mag-1102-mkiv.tex [...] mtx-context | fatal error: return code: 256 4. Fatal error in TeX Live, successful with beta: $ /Library/TeX/texbin/mtxrun --script context --autogenerate metafun.tex [...] mtx-context | fatal error: return code: 256 $ ~/context-osx-64/tex/texmf-osx-64/bin/mtxrun --script context --autogenerate metafun.tex [...] system | total runtime: 10.509 seconds of 10.569 seconds And so on. The above tests were done in two different terminal windows, with $PATH set accordingly. I have reported the full path to the executable for clarity. This is with Intel macOS. Is anyone able to reproduce these results? Or should I search for something wrong with my setup? Nicola