You obviously didn't read my first mailing correctly and copied an incomplete
version of my MWE. The
definitions of \Up and \Dn are right there before \starttext. Whether the
mathmatrix is empty of
not does not make a difference. For the sake of completeness I present you a
different MWE
Hi Henri,
I think your code has a problem: the first one is that the definition of \Up
and \Down is not understood when I compile your example, and then you introduce
an empty mathmatrix which creates a difficulty too.
Once I remove the definitions of \Up and \Dn the code is typeset (ConTeXt
Dear devs,
In the latest beta the interaction between mathalignment and mathmatrix is
broken. The biggest
problem is that documents containing this pattern do not typeset anymore at
all! (That makes 100
errors; please try again.) Please fix.
Cheers, Henri
---
\define\Up{\mathord\Uparrow}
