Gnome 3.2 in Ubuntu 11.10 Rendering Problems

Hello, I'm getting a lot of rendering problems in Gnome 3.2 in Ubuntu 11.10 when opening a few programs in multiples workspaces.

How to replicate:

1: Open some programs in first workplace, like, firefox, thunderbird, empathy, all in full size.
2: Go to second workplace, open more programs, like, terminal, nautilus, and others.
3: Push mouse to upper left corner, all seen normal, go back to first workplace and do the same. It will now show all windows from this workplace small (like it should), but in background it will show the windows from second workplace in full size. And if I go back to second workplace it's going to show the same weird thing, just reversed. It will also show some of the bottom of the windows from first workplace.

Here are some screenshots:

http://imageshack.us/photo/my-images/21/capturadetelaem20111019.png/

http://imageshack.us/photo/my-images/193/capturadetelaem20111019.png/

http://imageshack.us/photo/my-images/406/capturadetelaem20111019.png/