changing the icon's position on the launcher

[Ngassam Nkwenga]

Binary package hint: unity

when changing the icon's position on the launcher, by holding the icon with the mouse pointer, this icon become invisible.

just see the empty place on the launcher from the attached pic.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.6.4-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-6.34-generic 2.6.38-rc7
Uname: Linux 2.6.38-6-generic i686
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,vpswitch,compiztoolbox,place,session,grid,regex,shift,gnomecompat,mousepoll,resize,move,animation,wall,wobbly,thumbnail,workarounds,expo,ezoom,staticswitcher,fade,opacify,scale,unityshell]
CompositorRunning: compiz
DRM.card0.VGA.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1280x1024 1280x1024 1152x864 1024x768 1024x768 1024x768 832x624 800x600 800x600 800x600 800x600 640x480 640x480 640x480 640x480 720x400
 edid-base64: AP///////wBOjiIAOTFTRxEPAQNsJh54Km+GolpNlCQaT1S/74CBgHFPAQEBAQEBAQEBAQEBMCoAmFEAKkAwcBMAeC0RAAAeAAAA/QA4Sx5RDgAKICAgICAgAAAA/ABTQU1UUk9OCiAgICAgAAAA/wBIOU5ZNDMyNDI1CiAgAHY=
Date: Fri Mar 11 17:53:34 2011
DistUpgraded: Log time: 2011-02-19 18:33:53.969054
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus: dahdi, 2.3.0.1+dfsg-2ubuntu1: added
GraphicsCard:
 nVidia Corporation NV44A [GeForce 6200] [10de:0221] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Device [196e:02f3]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110212)
InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110212)
InstallationMedia__: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110212)
MachineType: Sony Corporation PCV-RSM22(CE)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-6-generic root=UUID=90589526-606e-4213-97b7-f0b5d7b613eb ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-6.34-generic 2.6.38-rc7
ProcVersionSignature__: Ubuntu 2.6.38-6.34-generic 2.6.38-rc7
Renderer: Unknown
SourcePackage: unity
UpgradeStatus: Upgraded to natty on 2011-02-24 (14 days ago)
dmi.bios.date: 06/26/2003
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1006
dmi.board.name: P4SD-VX
dmi.board.vendor: ASUSTek Computer Inc.
dmi.board.version: To be filled by O.E.M.
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: RS
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1006:bd06/26/2003:svnSonyCorporation:pnPCV-RSM22(CE):pvrToBeFilledByO.E.M.:rvnASUSTekComputerInc.:rnP4SD-VX:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrRS:
dmi.product.name: PCV-RSM22(CE)
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: Sony Corporation
version.compiz: compiz 1:0.9.4-0ubuntu4
version.libdrm2: libdrm2 2.4.23-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu1
version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu11
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu5