Gnome 3.6.1 doesn't work with startx anymore, only with gdm

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http://unix.stackexchange.com – I normally prefer my system to boot in text mode and manually start Gnome with startx but if I do that with Gnome 3.6.1, I get many errors and a basically unusable operating system. After installing gdm however, Gnome works perfectly fine again. Why is that and how can I return to my startx? Detailed explanation: I use archlinux and after a system update this morning (2012-11-1) with pacman -Syu which upgraded my Gnome to 3.6.1 I could not successfully boot Gnome 3 anymore. The graphical user interface was there but there was an error message like "There was an error, all extensions are dea (HowTos)