Hi, there is a \relax missing at the end of \hskip (line 342): \unexpanded\def\buff_scite_slxb#1%   {% we can have a side float    \advance\hangindent\numexpr#1+2\relax\scitespaceskip -  \begstrut\hskip#1\scitespaceskip +  \begstrut\hskip#1\scitespaceskip\relax    \ifcase\hangafter      \hangafter\plusone\relax    \fi} Wolfgang