The other thing is that the PS3 outputs a signal that my pre-pro won't apply matrixed surround modes to, which is something I consider a must-have.
My PS3 outputs stereo audio with only two channels of HDMI audio. At one point mine was doing the 7.1 channels active for stereo signals with all the extra ones carrying silence. But it seemed to have stopped after some firmware update. Have a look through your audio settings too. I know there's nothing which spells that out, but there's a setting for output of CD audio. Make sure that's set to the 44.1,... sampling rates, and not the 48 kHz default. Otherwise, I dunno.
