desktop hangs on startup with Unity 3d

Binary package hint: unity

Unity-3d hangs when I log-in, either from initial boot or by logging-out and trying to log-in again.

Unity-2d opens correctly if I choose that option on logging-in.

The desktop with Unity-3d shows correct background image and desktop launcher icons, top unity bar without any icons at the right, and the vertical launcher bar with its icons. However, start-up programs do not open, right-clicking the desktop does not open menu, clicking or right-clicking launchers on the desktop has no effect, and clicking icons in launcher bar has no effect. Ctl-Alt-T does not open a terminal.

The only working escape routes are Ctl-Alt-Bckspce, which "kills" the session and returns me to log-in window, or Ctl-Alt-Del, which re-boots.

The re-enabling of the "patch" two days ago did not cure the problem, which seems to have started when the patch was originally disabled. Using Natty, updated daily or more frequently.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.2.16-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.37-12.26-generic 2.6.37
Uname: Linux 2.6.37-12-generic x86_64
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/allscreens/options/active_plugins'
CompositorRunning: compiz
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1280x800 1280x720 1152x768 1024x768 800x600 848x480 720x480 640x480
 edid-base64: AP///////wAyDAAAAAAAAAAOAQKAIRV4Cg8Ql1hSiCgjUFQAAAABAQEBAQEBAQEBAQEBAQEB1RsAoFAgFzAwICYAIRUQAAAZAAAAAAAAAAAAAAAAAAAAAAAAAAAA/gBMR1BoaWxpcHNMQ0QKAAAA/gBMUDE1NFcwMS1BNUsyACk=
DRM.card0.VGA.1:
 status: disconnected
 enabled: disabled
 dpms: On
 modes:
 edid-base64:
Date: Sun Jan 30 11:38:57 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard: Subsystem: Hewlett-Packard Company Device [103c:3085]
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
InstallationMedia_: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
Lsusb:
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Hewlett-Packard Pavilion ZV6000 (PX343UA#ABA)
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 LC_MESSAGES=en_US.utf8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.37-12-generic root=UUID=df22cfd8-7282-4eec-bc00-d2870ed5fccc ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.37-12.26-generic 2.6.37
Renderer: Hardware acceleration
SourcePackage: unity
UnitySupportTest:

dmi.bios.date: 08/24/2006
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.1C
dmi.board.name: 3085
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 42.3B
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.1C:bd08/24/2006:svnHewlett-Packard:pnPavilionZV6000(PX343UA#ABA):pvrF.1C:rvnHewlett-Packard:rn3085:rvr42.3B:cvnHewlett-Packard:ct10:cvrN/A:
dmi.product.name: Pavilion ZV6000 (PX343UA#ABA)
dmi.product.version: F.1C
dmi.sys.vendor: Hewlett-Packard
version.libdrm2: libdrm2 2.4.23-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10-1ubuntu1
version.xserver-xorg: xserver-xorg 1:7.5+6ubuntu8
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.13.2+git20110124.fadee040-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A