When I rebuilt from r5966 (experimental), the behavior of \write-1 is OK. And...
> Here is what Robert's mwe gives on my system (with the \write-1 line > commented out) Thank you Jean-François, now I reproduced it. The behavior of logging from luaotfload is still unchanged with r5966. \input luaotfload.sty \font\x="Vollkorn:script=latn" \x A B \bye error: ...xmf-dist/tex/luatex/luaotfload/fontloader-2016-04-21.lua:13129: attempt to index upvalue 'parameters' (a nil value) should appear both in the console and in the log, but currently it appears only in the console. Hironobu
