Hi, these two options can be removed because MkIV has no \enablespacehandling and \enablekernhandling commands. \setvalue{\??aligncommand\v!spacing }{\t_spac_align_collected\expandafter{\the\t_spac_align_collected\enablespacehandling \enablekernhandling }} \setvalue{\??aligncommand\v!nospacing }{\t_spac_align_collected\expandafter{\the\t_spac_align_collected\disablespacehandling\disablekernhandling}} Wolfgang