Hi Hans, A few months back you announced some new tabulate features and gave some examples, from which I have taken the following MWE: \starttext \starttabulate[|lG{}|lG{}|] \NC \showglyphs \setalignmentcharacter{=}111=111 \NC \setalignmentcharacter{=}111=111 \NC\NR \stoptabulate \stoptext This works under "ConTeXt ver: 2022.01.10 08:36 LMTX fmt: 2022.1.13 int: english/english" but fails to compile under "ConTeXt ver: 2022.07.06 21:42 LMTX fmt: 2022.7.9 int: english/english" with the Lua error: callback error: ...-64/tex/texmf-context/tex/context/base/mkxl/node-ali.lmt:366: attempt to index a nil value (field '?') stack traceback: ...-64/tex/texmf-context/tex/context/base/mkxl/node-ali.lmt:366: in upvalue 'openup' ...-64/tex/texmf-context/tex/context/base/mkxl/node-ali.lmt:596: in upvalue 'third_pass' ...-64/tex/texmf-context/tex/context/base/mkxl/node-ali.lmt:613: in upvalue 'nodes_handlers_fixmathalign' [string "local tonut = nodes.tonut..."]:17: in function <[string "local tonut = nodes.tonut..."]:8> (...tail calls...) ...-64/tex/texmf-context/tex/context/base/mkxl/node-pro.lmt:148: in function <...-64/tex/texmf-context/tex/context/base/mkxl/node-pro.lmt:146> Narrowing it down a bit, it seems to be the use of G{} as the MWE works with a plain \starttabulate[|l|l|] on the latest ConTeXt. — Bruce Horrocks Hampshire, UK