Leadtek 7800GTX SLI VIVO + Winfast PVR issues

[FragMagnet]

I have the above setup using 81.98 drivers and the latest WDM driver. Whenever you try to launch Winfast PVR, the screen goes black ? Both cards are VIVO. Has anyone resolved this issue ? or know where to look into it ? I couldn't find much info on the Leadtek site. I'm trying to use it to record off an incoming S-video connection. The VIVO hookup is on the top card.