tried to capture the behaviour in a photograph...see attached.
black bars jump over the screen when a button is pressed or menus are opened. 2d unity works fine...just the 3d version has these problems.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12
Uname: Linux 3.2.0-20-generic x86_64
.tmp.unity.support.test.0:
ApportVersion: 1.95-0ubuntu1
Architecture: amd64
CompositorRunning: compiz
Date: Sat Mar 24 10:32:12 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
MachineType: Hewlett-Packard HP Pavilion dv6 Notebook PC
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-20-generic root=UUID=65694525-1469-41eb-bf89-e790fd9b7c39 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/22/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.14
dmi.board.name: 3635
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 33.23
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.14:bd03/22/2010:svnHewlett-Packard:pnHPPaviliondv6NotebookPC:pvr049D210000241210000020000:rvnHewlett-Packard:rn3635:rvr33.23:cvnHewlett-Packard:ct10:cvrN/A:
dmi.product.name: HP Pavilion dv6 Notebook PC
dmi.product.version: 049D210000241210000020000
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.7.2-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu35
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
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
---
.tmp.unity.support.test.0:
ApportVersion: 1.95-0ubuntu1
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,resize,place,mousepoll,compiztoolbox,snap,move,regex,grid,vpswitch,session,imgpng,gnomecompat,animation,expo,wall,workarounds,unitymtgrabhandles,ezoom,fade,scale,unityshell]
CompositorRunning: None
DistUpgraded: Fresh install
DistroCodename: precise
DistroRelease: Ubuntu 12.04
DistroVariant: ubuntu
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
MachineType: Hewlett-Packard HP Pavilion dv6 Notebook PC
Package: unity 5.8.0-0ubuntu1
PackageArchitecture: amd64
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm
PATH=(custom, no user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-20-generic root=UUID=65694525-1469-41eb-bf89-e790fd9b7c39 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12
Tags: precise precise precise ubuntu
Uname: Linux 3.2.0-20-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 03/22/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.14
dmi.board.name: 3635
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 33.23
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.14:bd03/22/2010:svnHewlett-Packard:pnHPPaviliondv6NotebookPC:pvr049D210000241210000020000:rvnHewlett-Packard:rn3635:rvr33.23:cvnHewlett-Packard:ct10:cvrN/A:
dmi.product.name: HP Pavilion dv6 Notebook PC
dmi.product.version: 049D210000241210000020000
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.7.2-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu35
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
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
and please excuse the spelling in the title of the bug report.