Hi Hans and Mikael,
I think there is an issue with the size of math fonts in \frac when used in
math alignments, as it is is shown in the following example.
%% begin bug-mathalignment.tex
\definemathmatrix[alignedcases]
[align={1:right,2:left,3:left},
distance=3pt,
left={\left\{},
right={\right.},
style=\displaystyle]
\starttext
Consider this
\placeformula
\startformula
\startalignedcases
\NC - \Delta u \NC = 0 \NC \qquad\text{in }\, \Omega \NR
\NC \frac{\partial u}{\partial {\bi n}} \NC = V u + \phi \NC \qquad\text{on
}\, \partial\Omega. \NR
\stopalignedcases
\stopformula
or this (with\type{\displaystyle} added)
\placeformula
\startformula
\startalignedcases
\NC - \Delta u \NC = 0 \NC \qquad\text{in }\, \Omega \NR
\NC \displaystyle\frac{\partial u}{\partial {\bi n}} \NC = V u + \phi \NC
\qquad\text{on }\, \partial\Omega. \NR
\stopalignedcases
\stopformula
Actually, one should have this
\startformula
\frac{\partial u}{\partial {\bi n}} = V u + \phi \qquad\text{on }\,
\partial\Omega.
\stopformula
If one adds \type{\displaystyle} both to the numerator and denominator of
\type{\frac}, the result is correct:
\placeformula
\startformula
\startalignedcases
\NC - \Delta u \NC = 0 \NC \qquad\text{in }\, \Omega \NR
\NC \frac{\displaystyle\partial u}{\displaystyle\partial {\bi n}} \NC = V u +
\phi \NC \qquad\text{on }\, \partial\Omega. \NR
\stopalignedcases
\stopformula
\stoptext
%% end bug-mathalignment.tex
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