Hello, In the following document I get spaces between the "a" and the "b", but not between "d" and "b". Bug or feature? This is XeTeX, Version 3.1415926-2.2-0.999.6 (miktex): \documentclass{book} \XeTeXinterchartokenstate=1 \begin{document} \XeTeXcharclass `\b 2 \XeTeXcharclass `\d 3 aba dbd \end{document} -- Ulrike Fischer