Hope I am in correct forum for this...
Before upgrading kde the other day, my opengl screensaver worked fine - now it doesn't. None of my screensavers were working. Checked synaptic, and had to install kde-artwork-kscreensaver, and rebooted. Got my non-openGL screensavers to work on the test, but not the openGL screensavers. When I choose an openGL screensaver in Configure Your Desktop/Display and Monitor/Screen Saver, and then press "test", either a window opens and closes quickly with me barely seeing it, or it opens a white or black screen with nothing happening. I click desktop with the blank screen, and it takes me back to Configure Your Desktop/Display and Monitor/Screen Saver.
I searched a little, and saw where to make sure all the xscreensaver's are installed (especially xscreensaver-gl), which they all are.