Distorsive image on clone mode with Full screen device dis..

I use the clone mode with my videocard (GeForce 4 MX 440) on tv and monitor (I have disabled "Full screen device", I don't mind seeing the same in the tv and in the monitor). But in BsPlayer (this doesn't happen in WMP) the image is distorted, in the monitor and in the tv, when I turn to single mode I see the image perfect. I hope you understand me.