thanks for looking into that for me Lyle, it turns out it was actually under the VIDEO menu parameters on page 43, the Audio for HDMI option was set to for TV + AMP, I had to set it to AMP only to get the proper 5.1 DD and DTS working, i wonder why it worked for PS3 regardless of the setting though....
anyhow, thank you so much for your help, guys, i can go to bed happy tonight