Hey guys after installing ubuntu 12.04 I faced several problems with My Graphics card. Folowing this question: I was able to install my Catalyst and everything seems OK. The only problem I have is Chrome. Facebook, Youtube and maybe other sites are messed up.. I checked this question too but, I have already installed the correct drivers.
A temporary workaround that worked for me is to disable the PepperFlash plugin in Google Chrome.
Disable the PepperFlash plugin as shown in the screenshot below.
Restart Google Chrome
After this, all of my Facebook and YouTube rendering issues disappeared. But I would keep checking the question you mentioned, and keep your graphics card driver updated.
Source: http://www.ubuntuvibes.com/2012/07/how-to-fix-rendering-issues-in-google.html