Comment 9 for bug 117482

I'm currently using 8.10. Downgraded because my older computer - Dell GX240 - became really slow with 9.04. I mistakenly was scrolling through the Gnome screensavers and hit the molecule one. Now, I can't go back to even change the screensaver as it automatically freezes the whole computer. How can I reset the screensaver to at least "blank"?