I added the Retro screensaver to my /Library/Screen Savers folder, and it appears in System Preferences. If I select it and click test, it works properly. However, when I actually invoke the screen saver through a shortcut, like corner of the screen, it just shows black, with a little bit of static. It's as if it isn't first taking a desktop snapshot before it shows the effect. Anyone else having this problem? or how can I fix it?