Happens to me too. Not only on alt-tab. It occures randomly for me on window unmimize. Ubuntu 12.04 i686 nVidia 295.40
p.s. occured just now, when i mistype my user password in auth window. Instead of saying that the password is wrong the window content becomes white.
Happens to me too. Not only on alt-tab. It occures randomly for me on window unmimize.
Ubuntu 12.04 i686
nVidia 295.40
p.s. occured just now, when i mistype my user password in auth window. Instead of saying that the password is wrong the window content becomes white.