Hi, if I'm right, `kpsewhich' was case sensitive until TL 2017 but that's not the case with TL 2018. Indeed, if a, say, `HyperRef.sty' is in ~/texmf/tex/latex/ : ┌──── │ $ kpsewhich hyperref.sty │ /home/bitouze/texmf/tex/latex/HyperRef.sty └──── Is it the intended behavior? (I hope not) -- Denis