Dear Otared,
I run your code and got the output which is as same as in your file
align-mkii.pdf
I don't know why you got align-mkiv.pdf.
In my log file,
ConTeXt ver: 2011.10.08 11:42 MKIV fmt: 2011.10.12 int: english/english
...
mkiv lua stats > luatex banner - this is luatex, version
beta-0.70.1-2011051908 (rev 4277)
Something in your system is different from mine.
I am sorry that I couldn't give you a solution.
Best regards,
Dalyoung
> Best regards: OK
> PS: Here is the source file:
> %%% align-mkiv.tex
> % defining an alignment structure
> \definemathmatrix[alignedcases]
> [align={right,left,left},
> distance=3pt,
> left={\left\{\;},
> right={\right.},
> style=\displaystyle]
>
> \starttext
>
> \startformula
> \startalignedcases
> \NC -\partial_t \Delta \psi + \Delta^2 \psi - \Delta \psi \NC = 0 \NC \quad
> \mbox{in }\, (0,\infty)\times \Omega \NR
> \NC \psi (0,x) \NC= \psi_0(x) \NC \quad \mbox{in }\, \Omega \NR
> \NC \psi (t,\sigma ) \NC= 0 \NC \quad \mbox{on }\, (0,\infty)\times
> \partial\Omega \NR
> \NC {\partial \psi \over \partial {\bf n}}(t,\sigma ) \NC = 0 \NC \quad
> \mbox{on }\, (0,\infty)\times \partial\Omega.
> \stopalignedcases
> \stopformula
>
> \stoptext
> %%% end align-mkiv.tex
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