I have similar experience. Well, the screensaver doesn't immediately crash my 8.10, but after running overnight ( I fell asleep ), in the morning when I try to use my desktop again, it prompts for passoword, entered, then nothing happens. The mouse still runs, but no menu. Only wallpaper. And the keyboard gets locked, no ALT+F1 access, etc. I have to poweroff. Anyone as similar error? Got a workaround? Thank you.