I cannot use progDVB (or any other ddshow player like fo ex. wmp9) with the mpeg2 codec of my choice (->NVDVD) to decode a video

I installed NVDVD and verified that its codecs are registered using DXMAN.

In progdvb I am using a nvidia filter graph but as soon as the graf comes to connecting the video render I get a "Pin Not connected" error.
In grafEdit I cannot open the graf -> class unknown or so.

Any idea what I am doing wrong?
Thanks,
Dominik