It is possible that the trash icon is somehow not displaying - someone reported
in in forums:
http://www.uluga.ubuntuforums.org/showthread.php?t=752092&page=1
and I am also experiencing this - no trash applet is visible, adding it
to the panel doesn't help, restarting GNOME (ctrl-alt-bksp, alt-p
I am experiencing the exact same behaviour as Luis Villa - although I
use GeForce video. Screensaver used to work before (Hardy), I only
noticed a few days ago that it stopped.
However, turning compiz off and back on helps.
--
On Hardy screen saver never displays
https://bugs.launchpad.net/bugs/