There is an issue/bug that I've been having and I'm sure others have had the same experience. Since I installed Windows 7 64bit, Dark Avatar and Twilight would start with a blank screen and then crash when I would run the program with two monitors. It worked fine in Vista 64bit dual screen mode. I could even keep the CPU gadget on the second monitor so I could see when my resources were getting low. When I disabled the second screen in Appearance and Personalization the program runs fine.
Attention Stardock: Please patch this problem. This fix must only be a temporary work-around and not a permanent solution. I want to use dual screen mode! Thank you.