Hi, I was experimenting with variable fonts in ConTeXt. While all seems to work well when using a ttf font (like Recursive_VF_1.085.ttf), I am struggling to use .otf ones, like the Source Code Pro (downloaded from https://github.com/adobe-fonts/source-code-pro/releases/tag/2.042R-u%2F1.062... ). Minimal example: ________________________________________ \definefontfeature[myaxis][axis={weight=500}] \definefontfamily[mainface][rm][Source Code VF] [features={default, myaxis}] % Works when replacing the two above lines with these %\definefontfamily[mainface][rm][Recursive] % [features={default, myaxis}] \setupbodyfont[mainface] \starttext \mainface Hallo \stoptext ________________________________________ The (from what I understand) relevant part of the log is: __________________________________________________________________________ fonts > otf loading > loading '/home/florent/.local/share/fonts/SourceCodeVF-Upright.otf', hash 'sourcecodevf-upright-weight-500' otf reader > user instance: weight=500, factors: 0.42857142857142855 otf reader > cff > unknown local call 2, bias 107, case 2 : [48 32 60 164 26 72] n=6 otf reader > cff > unknown local call 2, bias 107, case 2 : [-10 42 -33 -90 10 26] n=6 otf reader > cff > unknown local call 2, bias 107, case 2 : [176 292 -5 -14 -15 -40] n=6 otf reader > cff > unknown local call 90, bias 107, case 2 : [-94 -168 -54 -92 28 76 49 132 5 14 -2 -4] n=12 otf reader > cff > unknown local call 2, bias 107, case 2 : [26 -26 21 58 -21 -58] n=6 otf reader > cff > unknown local call 1, bias 107, case 2 : [152 270 -25 -70 -38 -102] n=6 otf reader > cff > unknown local call 1, bias 107, case 2 : [-152 266 25 70 -36 -98] n=6 otf reader > cff > unknown local call 17, bias 107, case 2 : [] n=0 otf reader > cff > unknown local call 464, bias 107, case 2 : [] n=0 otf reader > cff > unknown local call 776, bias 107, case 2 : [172 29 80] n=3 otf reader > fatal error in file '/home/florent/.local/share/fonts/SourceCodeVF-Upright.otf': /home/florent/lmtx/tex/context/base/mkxl/font-cff.lmt:1956: attempt to perform arithmetic on a nil value (field '?') stack traceback: /home/florent/lmtx/tex/context/base/mkiv/font-otr.lua:2350: in metamethod 'mul' /home/florent/lmtx/tex/context/base/mkxl/font-cff.lmt:1956: in local 'a' /home/florent/lmtx/tex/context/base/mkxl/font-cff.lmt:2508: in upvalue 'process' /home/florent/lmtx/tex/context/base/mkxl/font-cff.lmt:2685: in upvalue 'processshape' /home/florent/lmtx/tex/context/base/mkxl/font-cff.lmt:2834: in upvalue 'parsecharstrings' /home/florent/lmtx/tex/context/base/mkxl/font-cff.lmt:3067: in upvalue 'readnoselect' /home/florent/lmtx/tex/context/base/mkxl/font-cff.lmt:3279: in local 'reader' /home/florent/lmtx/tex/context/base/mkiv/font-otr.lua:2094: in upvalue 'readtable' /home/florent/lmtx/tex/context/base/mkiv/font-otr.lua:2203: in upvalue 'readdata' /home/florent/lmtx/tex/context/base/mkiv/font-otr.lua:2263: in function [C]: in function 'xpcall' /home/florent/lmtx/tex/context/base/mkiv/font-otr.lua:2352: in upvalue 'loadfont' /home/florent/lmtx/tex/context/base/mkiv/font-otr.lua:2407: in field 'loadfont' /home/florent/lmtx/tex/context/base/mkxl/font-otl.lmt:160: in field 'load' /home/florent/lmtx/tex/context/base/mkxl/font-otl.lmt:663: in upvalue 'otftotfm' /home/florent/lmtx/tex/context/base/mkxl/font-otl.lmt:691: in function (...tail calls...) /home/florent/lmtx/tex/context/base/mkxl/font-def.lmt:364: in function (...tail calls...) /home/florent/lmtx/tex/context/base/mkxl/font-def.lmt:467: in field 'read' /home/florent/lmtx/tex/context/base/mkxl/font-ctx.lmt:1385: in function (...tail calls...) fonts > otf loading > loading failed due to read error fonts > defining > forced type 'otf' of 'SourceCodeVF-Upright' not found __________________________________________________________________________ Interestingly, all works well if I delete the file SourceCodeVF-Upright.otf from my font directory to force the use of SourceCodeVF-Upright.ttf instead. Is there something wrong in my example which causes issues with the otf variant? Cheers, Florent