Cannot log in to Gnome, only the default wallpaper shown.

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https://bbs.archlinux.org – I install fresh Arch with gnome 3.2. But after I log in, I can only see a default wallpaper and my movable cursor. (DBus is started of course)this is the log :X.Org X Server 1.11.4 Release Date: 2012-01-27 X Protocol Version 11, Revision 0 Build Operating System: Linux 3.2.2-1-ARCH i686 Current Operating System: Linux halo 3.2.12-1-ARCH #1 SMP PREEMPT Mon Mar 19 17:48:35 UTC 2012 i686 Kernel command line: root=/dev/sda6 ro nomodeset Build Date: 29 January 2012 03:41:53PM Current version of pixman: 0.24.4 Before reporting problems, check http://wiki.x.org to make sure that you have the latest v (HowTos)