Menu bar becomes blank periodically

Binary package hint: unity

Using natty with all updates.

Whenever I open a window in Unity, the menu bar becomes partially or fully blank (though the notification area remains as normal). This occurs with almost every app. But I am sure that the menu bar is there, because if I click at that area, menus come as normal, but the bar still remains blank.

I have also noticed a rhythm in how they become blank; When I start gnome-terminal, it becomes partially blank, however if I open a tab in the terminal (using either the menu or the keyboard shortcut), the menu bar comes back. If I switch the tab back to the first one in gnome-terminal, the bar becomes blank (partially or fully) once again.

Attached are some screenshots.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.2.0-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.37-7.18-generic 2.6.37-rc3
Uname: Linux 2.6.37-7-generic i686
Architecture: i386
CheckboxSubmission: 5e476a0872a6160d4830741693075266
CheckboxSystem: 1e11ce1f0b739629ea3e4cbfa4fff3ab
CompizPlugins: [core,ccp,move,resize,place,decoration,png,neg,commands,svg,session,text,regex,imgjpeg,annotate,mousepoll,workarounds,vpswitch,dbus,gnomecompat,snap,resizeinfo,shift,animation,wobbly,fade,cube,scale,3d,rotate,scaleaddon,cubeaddon,expo,ezoom,staticswitcher]
Date: Tue Nov 30 14:15:38 2010
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
InstallationMedia_: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: TOSHIBA TECRA A7
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
PciDisplay: 01:00.0 VGA compatible controller [0300]: ATI Technologies Inc M56P [Radeon Mobility X1600] [1002:71c5] (prog-if 00 [VGA controller])
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.37-7-generic root=UUID=ba586c06-64e7-4734-a35f-5320ea8063a4 ro quiet splash
ProcVersionSignature_: Ubuntu 2.6.37-7.18-generic 2.6.37-rc3
RelatedPackageVersions:
 xserver-xorg 1:7.5+6ubuntu3b1
 libgl1-mesa-glx 7.9+repack-1ubuntu2
 libdrm2 2.4.22-2ubuntu1
 xserver-xorg-video-intel 2:2.13.0-1ubuntu1
 xserver-xorg-video-ati 1:6.13.2-1ubuntu2
SourcePackage: unity
XorgConf: Error: [Errno 2] No such file or directory: '/etc/X11/xorg.conf'
dmi.bios.date: 08/30/2006
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 2.00
dmi.board.name: MPAD-MSAE Customer Reference Boards
dmi.board.vendor: Intel Corporation
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr2.00:bd08/30/2006:svnTOSHIBA:pnTECRAA7:pvrPTA71E-09401CAR:rvnIntelCorporation:rnMPAD-MSAECustomerReferenceBoards:rvrNotApplicable:cvnNoEnclosure:ct1:cvrN/A:
dmi.product.name: TECRA A7
dmi.product.version: PTA71E-09401CAR
dmi.sys.vendor: TOSHIBA
system: distro = Ubuntu, architecture = i686, kernel = 2.6.37-7-generic