Hi Brooks
The following simple file works fine if I comment out the \usemodule[newmat] line, but crashes if I put it in.
\usemodule[newmat] \starttext \placeformula \startformula \eqalign{\frac{1}{2} \cr} \stopformula \stoptext
ah ... the alignment lookahead problem, i think we can safely patch \mathematics to catch lookahead as well as make frac more robust for unwanted expansion
\usemodule[newmat]
\unexpanded\def\frac#1#2{\mathematics{\genfrac{}{}{}\donothing{#1}{#2}}}
\def\mathematics#1{\relax\ifmmode#1\else$#1$\fi}
\starttext
\placeformula \startformula \eqalign{\frac{1}{2}} \stopformula
\stoptext
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