Hi Wolfgang and Hans, I have the following sample: \setuppapersize[A5] \definefontfeature[default][default] [protrusion=quality, expansion=quality] \definefontfamily[mainface][rm][Source Serif Pro] \setupalign[hanging, hz] \setupbodyfont[mainface, 17pt] %~ \setupbodyfont[helvetica, 17pt] \starttext \input zapf \stoptext hz doesn’t work fine in MkXL, but it works fine in MkIV. I think the flow of characters is broken in MKXL. Some With TeX Gyre Heros (https://pdf.ousia.tk/mkiv-hz.pdf and https://pdf.ousia.tk/mkxl-hz.pdf): - "computer": line 5. - "basic": line 8. - "showing": line 10. With Source Serif Pro, also (https://pdf.ousia.tk/ssp-mkiv-hz.pdf and https://pdf.ousia.tk/ssp-mkxl-hz.pdf): - "publishing": line 2. - "about": line 4. - "between": line 10. I’m experiencing this wherever I use hz with MkXL. Sorry, but cannot the default values for quality font expansion be the same in MkIV and MkXL? Many thanks for your help, Pablo -- http://www.ousia.tk