Try to disable compiz or AIGLX.
To disable AIGLX, you could use following command in your /etc/X11/xorg.conf by adding option: Option "AIGLX" "false"
Try to disable compiz or AIGLX.
To disable AIGLX, you could use following command in your /etc/X11/xorg.conf by adding option:
Option "AIGLX" "false"