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Hi, the redefinition of \startalignment in math-ali.mkiv doesn’t cover \stopalignment. \ifdefined \startalignment \let\align_math_normal_start\startalign \let\align_math_normal_stop \stopalign \let\align_text_normal_start\startalignment \let\align_text_normal_stop \stopalignment \unexpanded\def\startalign {\ifmmode - \let\stopalign\align_math_normal_stop % cannot be an unexpanded def ... lookahead in align + \let\stopalign \align_math_normal_stop % cannot be an unexpanded def ... lookahead in align + \let\stopalignment\align_math_normal_stop % cannot be an unexpanded def ... lookahead in align \expandafter\align_math_normal_start \else - \let\stopalign\align_text_normal_stop + \let\stopalign \align_text_normal_stop + \let\stopalignment\align_text_normal_stop \expandafter\align_text_normal_start \fi} \let\stopalign \relax + \let\stopalignment\relax \let\startalignment\startalign - \let\stopalignment \stopalign \fi Wolfgang