Hi, the \or has to be replace with \else. \permanent\tolerant\protected\def\setlayeranchored[#1]#*[#2]%   {\begingroup    \ifarguments      \dowithnextbox        {\endgroup}% -  \or +  \else      \dowithnextbox        {\checkpositionoverlays         \setbox\b_pack_anchors\box\nextbox         \dontleavehmode\hpack{\pack_anchors_register{#1}{#2}}%         \endgroup}%    \fi    \hbox} Wolfgang