Desktop effects don't work on fc12

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http://forums.fedoraforum.org – Hi, on my Acer Aspire 6930G with Fedora 12 Gnome, "desktop effects" don't work; system freeze when i try to run it. Can anyone help me? Code: $ uname -r Code: $ lspci -nn | grep VGA 01:00.0 VGA compatible controller [0300]: nVidia Corporation GeForce 9600M GT [10de:0649] (rev a1) $ rpm -qa | grep -e nvidia -e livna livna-config-display-0.0.23-1.fc11.noarch xorg-x11-drv-nvidia-190.42-2.fc12.i686 xorg-x11-drv-nvidia-libs-190.42-2.fc12.i686 kmod-nvidia-190.42-1.fc12.4.i586 kmod-nvidia- Code: $ cat /etc/X11/xorg.conf # Xorg configuration created by livna-config-display Section "Files"     ModulePath  "/usr/lib/xorg/modules/extensions/nvidia"         ModulePath  "/usr/lib/xorg/modules" EndSection Section "ServerFlags"     Option        "AIGLX" "on" EndSection Section "Device"     Identifier  "Videocard0"     Driver      "nvidia"     Option        "AddARGBGLXVisuals" "True" EndSection Section "Extensions"     Option        "Composite" "Enable" EndSection Thanks. Sagitter (HowTos)