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  
ver: 2017.09.05 15:10 MKIV beta).
Can you please give a more detailed example where you see the problem?

Best regards: OK

> On 8 Sep 2017, at 06:51, Henri <henrime...@gmail.com> wrote:
> 
> \define\Up{\mathord\Uparrow}
> \define\Dn{\mathord\Downarrow}
> 
> \starttext
> 
> \placeformula
> \startformula
>   \startmathalignment
>     \NC \psi_{+,\Up} ...
>     \startmathmatrix
>     \stopmathmatrix
>     \NR
>     \NC \psi_{+,\Dn} ...
>     \NR
>   \stopmathalignment
> \stopformula
> 
> \stoptext

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