I can confirm this, happens for me too. I have the screensaver disabled though, this has been happening since about 2 days ago after I previewed some of the screensavers.
It pops up after 5 minutes of no use, as there is the value set on the grayed out box by default. -- Screensaver starts, but shows a large white X, instead of the choosen screensaver https://launchpad.net/bugs/67952 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs