Did you download your driver from
here?
"Build by" drivers don't work properly on OEM cards.
No, it's not a hidden feature you've missed, the "modÄ?le: Mode Th?©atre" is only the name I've given to this scheme, so that I can switch between schemes "PC only" and "PC+TV" with a simple key stroke.
I've only one monitor and the TV attached to the video card, the DVI connector is free. So I've not enabled the secondary display, and in BSplayer neither. TV is just a clone.
Beside the driver mismatch I can't figure out where the problem is.