double clicking on windows top bar messes windows

[Carla Sella]

I have this problem:
When I open an application's window, let's say thunderbird for example, I maximise the window, then double click on the top bar the window unmaximises, but I cannot move it anywhere, the top bar like dissapears.
If you open other windows these open without the top bar, so you can't put them anywhere else on the desktop and have to keep them where they are.
The only way to close the windows is to use the application's menu.
See image-1.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.8.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-8.11-generic 3.0.1
Uname: Linux 3.0.0-8-generic x86_64
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,scale,session,unityshell]
CompositorRunning: compiz
Date: Sun Aug 14 16:12:40 2011
DistUpgraded: Log time: 2011-07-16 11:06:52.888709
DistroCodename: oneiric
DistroVariant: ubuntu
GraphicsCard:
 nVidia Corporation G86 [GeForce 8400 GS] [10de:0422] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: XFX Pine Group Inc. Device [1682:2310]
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
LightdmDisplayLog:

LightdmGreeterLog:

LightdmLog:

MachineType: System manufacturer System Product Name
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-8-generic root=UUID=1ab3c2d9-9b38-4502-9e2a-434ec6833169 ro quiet splash vt.handoff=7
SourcePackage: unity
UdevDb: Error: [Errno 2] No such file or directory
UpgradeStatus: Upgraded to oneiric on 2011-08-14 (0 days ago)
dmi.bios.date: 05/28/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0702
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M2N
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0702:bd05/28/2007:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2N:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.5.0-0ubuntu5
version.ia32-libs: ia32-libs 20090808ubuntu13
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental 7.11-0ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

[Omer Akram (om26er)]

gtkw-window-decorator is crashing. Can you check in /var/crash and report a new bug by double clicking on the .crash file with the name -gtk-window-decorator' in it so that the bug report have useful crash logs.

[Carla Sella (carla-sella)]

Don't know why, but now this problem of double clicking on the maximised window and not been able to move the window around any more happens only with thunderbird, the other applications seem not affected any more.
I launched an update and I also tried to install different video drivers, but had to reinstall the ones I had, so I don't know which of the two actions might have caused this.