Hi Hans, many thanks for having released the new beta. I experience opposite results with opbd. The first sample is: \definefontfeature[default][default][protrusion=quality, opbd=yes] \definefontfamily[mainface][rm][Linux Libertine O] \setupbodyfont[mainface, 300pt] \setuppagenumbering[location=] \setupalign[hanging] \showframe \starttext W \stoptext Although the value for that lfbd is only -29, the W is moved too much from its original position. The second sample is (font attached at https://mailman.ntg.nl/pipermail/ntg-context/2018/092527.html): \showframe \definefontfeature[default][default][protrusion=quality, opbd=yes] \definefontfamily[mainface][rm][TestOPBD] \setupbodyfont[mainface, 60pt] \setupalign[hanging] \starttext Ἠ\\ Ἠ\hfill Ἠ\\ Ἦ\hfill ὩὩ\\ ἯἯ\hfill ὩὩ \stoptext Here the changes are tiny. The right values are used in the image at https://github.com/wspr/fontspec/issues/282#issuecomment-287155442. Could you check it? Many thanks for your help, Pablo -- http://www.ousia.tk