Hi, i have Vista x64 with new gigabyte 780 motherboard and the latest powerdvd ultra. I have the HDMI port connected to my Pioneer Reciever. When i try to play a blueray or hd dvd disk, i dont get the dd or dts tracks on my reciever, instead i get stereo sound. Under the audio properties in powerdvd, i only get spdif or speaker number and not HDMI. I tried both speaker number and spdif options but i get no sound. The weird thing is when i do the speaker setup in vista audio control panel and choose dd or dts i get audio and the pioneer reciever show each codec.  In Windows Media Player DD and DTS 5.1 show up fine on my pioneer receiver and i do notice the sound difference.  Can you guys help me out?

Thanks