The Screen Savers don't start. Usually, the screen will just go blank. I've tried this with various selection(s) of screen savers; none of them start. If I click on "preview" they work, but they wont start automatically.
Are you running it as root? xscreensaver won't work for root.
it worked on 6.0 by mistake. There was a security update for 6.0 to fix this.