Scrolling makes screen fade to black

Hi all - ever since I upgraded to Leopard, I'm having a problem with Aperture where my whole library becomes black when I scroll through thumbnails. If I stop scrolling, eventually the pictures reappear. This makes it really hard to use Aperture since I can't really see what I'm doing. It happens fairly consistently, but isn't 100% reproducible. Any ideas?

Your screen can be set to fade to black after a specific amount of time to conserve battery life. You decide for how long you want it to stay on, anywhere from 10 seconds to 5 minutes. This will only affect the time between activity on your screen, so if you're swiping and pressing the screen quite a bit it won't go out until you stop accessing the screen then it'll start the countdown to the time you set.
To adjust it, swipe down while on your homescreen and select Settings>Display>Screen Timeout.
I hope that helps you.  
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