[ubuntu] X crashes on: Gnome Shell, Unity3d, Firefox, Thunderbird

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http://ubuntuforums.org – I just upgraded to Quantal and I have the following issues: 1. Logging into Gnome Shell or Unity 3d crashes X immediately and returns me to lightDM. 2. Starting Firefox and Thunderbird has a similar effect. I use nvidia proprietary driver, and 3d apps seem to work fine. I corrected all the problematic fontconfig files (see here: http://ubuntuforums.org/showpost.php...2&postcount=13), so they are not the problem. Here is my xsession-error file: Code: org.gtk.vfs.MountTracker.listMountableInfo call failed: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface `org. (Hardware)