For what it's worth, I don't think this is fixed still. I believe I tried
Sam's latest PPA and still got the issue. I will update again and give it
another go, though, to see if it is fixed.

On Fri, Apr 6, 2012 at 7:24 PM, Didier Roche <email address hidden> wrote:

> ** Changed in: unity (Ubuntu)
>       Status: Confirmed => Fix Committed
>
> ** Package changed: unity (Ubuntu) => compiz (Ubuntu)
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (936818).
> https://bugs.launchpad.net/bugs/940603
>
> Title:
>  white box randomly shows up at top left corner blocking applications
>  from using stuff under it
>
> Status in Compiz Core:
>  Fix Committed
> Status in Unity:
>  Fix Committed
> Status in “chromium-browser” package in Ubuntu:
>  Confirmed
> Status in “compiz” package in Ubuntu:
>  Fix Committed
>
> Bug description:
>  I've had this happen 3 times now.  I've gotten a white rectangular box
>  show up in the corner of the screen.  The box is of varying sizes, and
>  only goes away after a reboot.
>
>  I've been using chrome every time it's happened, but I don't know that
>  it's caused by chrome specifically.
>
>  ProblemType: Bug
>  DistroRelease: Ubuntu 12.04
>  Package: unity 5.4.0-0ubuntu2
>  ProcVersionSignature: Ubuntu 3.2.0-17.26-generic 3.2.6
>  Uname: Linux 3.2.0-17-generic i686
>  .tmp.unity.support.test.0:
>
>  ApportVersion: 1.93-0ubuntu2
>  Architecture: i386
>  CompizPlugins:
> [core,bailer,detection,composite,opengl,decor,vpswitch,move,mousepoll,gnomecompat,snap,compiztoolbox,wall,regex,resize,imgpng,place,animation,resizeinfo,grid,fade,session,workarounds,expo,unitymtgrabhandles,scale,ezoom,unityshell]
>  CompositorRunning: compiz
>  Date: Fri Feb 24 14:27:47 2012
>  DistUpgraded: Log time: 2012-02-17 15:21:15.462721
>  DistributionChannelDescriptor:
>   # This is a distribution channel descriptor
>   # For more information see
> http://wiki.ubuntu.com/DistributionChannelDescriptor
>   canonical-oem-dell-lucid-une-20100427-1
>  DistroCodename: precise
>  DistroVariant: ubuntu
>  GraphicsCard:
>   Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller
> (primary) [8086:2a02] (rev 0c) (prog-if 00 [VGA controller])
>     Subsystem: Dell Latitude D630 [1028:01f9]
>     Subsystem: Dell Device [1028:01f9]
>  InstallationMedia: Ubuntu 10.04 "Lucid" - Build i386 LIVE Binary
> 20100427-14:29
>  MachineType: Dell Inc. Latitude D630
>  PccardctlIdent:
>   Socket 0:
>     no product info available
>  PccardctlStatus:
>   Socket 0:
>     no card
>  ProcEnviron:
>   TERM=xterm
>   PATH=(custom, user)
>   LANG=en_US.UTF-8
>   SHELL=/bin/bash
>  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-17-generic
> root=UUID=fa8d2464-5942-4868-877b-6bed2f9b7c15 ro quiet splash vt.handoff=7
>  SourcePackage: unity
>  UpgradeStatus: Upgraded to precise on 2012-02-18 (6 days ago)
>  dmi.bios.date: 01/11/2008
>  dmi.bios.vendor: Dell Inc.
>  dmi.bios.version: A06
>  dmi.board.name: 0KU184
>  dmi.board.vendor: Dell Inc.
>  dmi.chassis.type: 8
>  dmi.chassis.vendor: Dell Inc.
>  dmi.modalias:
> dmi:bvnDellInc.:bvrA06:bd01/11/2008:svnDellInc.:pnLatitudeD630:pvr:rvnDellInc.:rn0KU184:rvr:cvnDellInc.:ct8:cvr:
>  dmi.product.name: Latitude D630
>  dmi.sys.vendor: Dell Inc.
>  version.compiz: compiz 1:0.9.7.0~bzr2995-0ubuntu5
>  version.libdrm2: libdrm2 2.4.30-1ubuntu1
>  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.1-0ubuntu2
>  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
>  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.1-0ubuntu2
>  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu4
>  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev
> 1:2.6.99.901+git20120126-0ubuntu2
>  version.xserver-xorg-video-ati: xserver-xorg-video-ati
> 1:6.14.99~git20111219.aacbd629-0ubuntu2
>  version.xserver-xorg-video-intel: xserver-xorg-video-intel
> 2:2.17.0-1ubuntu4
>  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
> 1:0.0.16+git20111201+b5534a1-1build2
>
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>