Gnome Shell with interface rendering issues and transition glitches

When I use the interface, everything is just messed up. The top bar (the one with the clock) is badly rendered, with distorted colors, grainy icons (the "app loading" animation icons looks like old TV's static). Some font characters are in the same situation.
The tooltips, as some application windows, appear distorted.
Every transition animation comes with screen blinking (only content). I think I can make a video of the user interaction in these problems.
Moreover, while I was trying to submit this report, gnome-shell just crashed, and I couldn't do a thing until I logged in text mode and restarted lightdm. This happened when I chose to attach the screen capture to this bug.

According to apt-cache, I'm using version 3.2.0-0ubuntu1 of the gnome-shell package
I also use the fglrx driver 2:8.881-0ubuntu4, for an ATI Mobility Radeon 3200 HD

I didn't try to use it without the driver, as the procedure of disabling/reenabling the driver is time consumming and I'm running the system in a netbook.

I don't know if I made myself clear, as english is not my native language, so please tell me if something is missing or unclear. =D

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gnome-shell 3.2.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu3
Architecture: i386
Date: Sun Oct 30 12:51:47 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 LANGUAGE=pt_BR:pt:en
 PATH=(custom, no user)
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)