The libreoffice package in [extra] has been flagged out of date since 2/7/2013. In the meanwhile, I've made a simple AUR PKGBUILD for Libreoffice 4.0 using the RPM's available on the libreoffice website. The package can be found at Libreoffice-rpm.
Sigh. It was due to a bug with freetype-2.5.1 and fc-cache. A nasty little show-stopper it is too!https://bbs.archlinux.org/viewtopic.php?pid=1357150The problem is that freetype-2.5.1, when combined with an updated fonts package (in my case ttf-google-fonts) results in fc-cache being supposed to run, but because it doesn't/can't this results in a non-starting DE and / or login manager.