SOLVED I'am an Arch and GNU/Linux n00b but I'm also a 'hardheaded/stubborn' guy when it's about solving a problem - even worst if it's related to my computer, lol. After looking and trying several things I narrowed the problem to 'rankmirrors'. I don't know why (was the package updated early?) because allways runned smooth here, but the file generated is somewhat corrupt. Seems it's time to fill a bug report :) BTW, Arch rules!! Thanks every single one for making this possible, I enjoy so much using it and I evangelize everybody about it, you all kick-ass people. Martín