restart xorg setxkbmap -option terminate:ctrl_alt_bksp set gnome-time-bar show date gsettings set org.gnome.desktop.interface clock-show-date true exclude kernel update in yum update in /etc/yum.conf: exclude=kernel* or yum --exclude=kernel* update something about install mayavi(Enthghout inc.) maybe it's need vtk and vtk-devel and easy_install it again.