OK, I have more bad (for me) news about the latest beta: it simply refuses to play with some of my fonts; most importantly for me with the Gentium fonts. Whenever I try to compile something with Gentium in it, I get the error message !luaTeX error (file /Users/tas/Library/Fonts/GenAR102.ttf): Invalid glyph index (gid 1699) ==> Fatal error occurred, no output PDF file produced! MtxRun | fatal error, code: 70 I have now compared the latest beta and an older one, and I think the culprit is this line: load otf | featurefile: /Users/tas/texmf/fonts/fea/context/greek- babel.fea luatex then goes on to create luatex-cache/context/408a90c432ceda2c1e4a80ad5d0e5350/fonts/otf/GenAR102@greek-babel.tma luatex-cache/context/408a90c432ceda2c1e4a80ad5d0e5350/fonts/otf/GenAR102@greek-babel.tmc The thing is, I know that Gentium doesn't work with this fea file; that's why I wrote one specifically for this font. Gentium is nowhere connected to this fea file. When I use an older version, this fea file is not used and GenAR102@greek-babel.tma is not created. The newer version creates it, and I have no clue why... Very puzzled Thomas