I have openSUSE 11.0 KDE4, with a widescreen (1680x1050) monitor using the ATI graphics driver. I tried to use the KDE Clock screensaver, which is one of the standard screensavers listed, but whenever I try to test it, all I get is a grey screen, and it never comes on when I set it as the screensaver. However, whenever I come back to the computer, as soon as I move the mouse the display blanks briefly and refreshes as if it was in the screensaver. I have tried other screensavers and they seem to work. What's the problem with this screensaver?

Thanks,
Dan