[SOLVED] Black Screen appears during the playback

[nekros]

While the movie is playing, the screen suddenly turns black, although the sound is still playing. I will measure the frequency when it happens and update the post later.
Moving the mouse or touching any key removes the black screen and resumes the video. It is not my screen saver.

I am using bs player version 1.37, build 826. My system is Win7, 64 bit, I got i7 processor, Nvidia Gforce 330M.
I use ffdshow codec, nothing else. In the beginning the video won't display at all, so I had to set the video rendering in preferences to VMR9 renderless. Do I need any additional codec?

Thanks for your help.