Ernesto: What does kpsewhich -var-value=TEXMFMAIN report? Looking at the texconfig script (albeit in TeXLive 2011), if you do not get even the version info, either kpsewhich -var-value=TEXMFMAIN fails or $TEXMFMAIN/../release-texlive.txt doesn't exist or your system doesn't have sed. Bob T.