Comment 9 for bug 666715

Same was here on an HD4225 on Acer Aspire One 521 with fglrx driver.
Before some Update the menus and some popup windows were totaly destroyed. Afterwards Unity didn't start at all. No Panel, no Mutter window manager. So only the desktop.
I put gnome-terminal into autostart apps, so I at least had that running (as the only UI). I could start Metacity from terminal, so the terminal got a window frame. I could not start unity nor mutter. "Segmentation fault" was the only reaction in terminal I got.