Some of your problems may be related to bug #40011.
Please post what version of GDM and gnome screensaver you have installed.Do this in a terminal and paste the result here: dpkg -l gdm gnome-screensaver
Some of your problems may be related to bug #40011.
Please post what version of GDM and gnome screensaver you have installed.Do this in a terminal and paste the result here:
dpkg -l gdm gnome-screensaver