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
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.