OK, after playing with our new toy on OS X, I have now fired up my linux (gentoo) partition. Both the beta and the latest trunk produce a luatex binary that can't generate formats: /luatexdir/lua/luanode.c:453: get_node: Assertion `varmem_sizes[r]<0' failed. /usr/local/texlive/2007/bin/powerpc-linux/fmtutil: line 315: 15027 Aborted ${1+"$@"} Thomas