Same for me. I confirm that reverting glx-diversion and *nvidia* from unstable to testing fixes this issue.
> sudo apt-get install -t testing glx-alternative-nvidia/testing > glx-diversions/testing nvidia-kernel-dkms/testing nvidia-driver/testing > nvidia-driver-bin/testing xserver-xorg-video-nvidia/testing > libegl1-nvidia/testing nvidia-vdpau-driver/testing libgles1-nvidia/testing > libnvidia-eglcore/testing libnvidia-eglcore/testing Didn't tried the Guy suggestion. -- Pascal Obry / Magny Les Hameaux (78) The best way to travel is by means of imagination http://v2p.fr.eu.org http://www.obry.net gpg --keyserver keys.gnupg.net --recv-key F949BD3B