Some code that worked ok but hasn't been used for some time, now gives an error: missing $. It is working fine in ConTeXt, but putting it inside an MPpage goes wrong. Here a minimal example, the output of the ConTeXt run and the error on the MPpage run. Has something changed I missed? Hans van der Meer The error occurs in this code, my suspect is the cases macro. \starttext \startsetups[dif-1] $\displaystyle \Delta_{in} = 1000_2 \cases{(A,2)(2,A)&\cr (6,E)(E,6)&\cr} \buildrel S_1 \over \rightarrow \quad \Delta_{uit} = 1011_2 \cases{(6,D)(D,6)&\cr (B,0)(0,B)&\cr} $ \stopsetups \startMPpage label("\setup[dif-1]",origin); \stopMPpage \stoptext tex error > tex error on line 9 in file /Users/hansm/Documents/TeX/Test-tex/cases/cases.tex: ! Missing $ inserted <inserted text> $ <to be read again> \endgroup \math_fenced_fenced_stop ...leparameter \endgroup \advance \c_math_fenced_ne... \14>:dif-1 ...ses {(A,2)(2,A)&\cr (6,E)(E,6)&\cr } \buildrel S_1 \over \right... l.9 ...edfont[LMRoman-Regular*default]\setup [dif-1] <to be read again> \relax ... l.12 \stopMPpage The ConTeXt run itself is ok, see below \starttext \startsetups[dif-1] $\displaystyle \Delta_{in} = 1000_2 \cases{(A,2)(2,A)&\cr (6,E)(E,6)&\cr} \buildrel S_1 \over \rightarrow \quad \Delta_{uit} = 1011_2 \cases{(6,D)(D,6)&\cr (B,0)(0,B)&\cr} $ \stopsetups \setup[dif-1] \stoptext