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 ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------