I'm using two 8600GTS cards in SLI mode and have installed the latest 64 bit nvidia drivers for my cards and chipset. When SLI is enabled, audio continues normally but the video repeatedly flashes. Occasionally I'll experience black screens too but only within the software....not the wholescreen. When SLI is disabledboth mediaplayer and media center function normally. I've tried choosing single gpu mode in the nvidia control panel while using SLI in an attempt to "trick" the softwarewithout success. Media player and media center will not perform properly unless SLI is disabled. Does anyone have a solution for my problem? Is anyone else using SLI mode and not experiencing what I am? I'm at my wits end over this.