Thanks a lot, Bruce!
I found the site you point to some time ago but dismissed it because it was posted in 2006 and since then MAC and its OS changed a lot, but after seeing your post I read it and to my surprise I see the same exact settings I performed in my MAC after testing for a long time with different Video files and formats.
I have a Sony receiver that I use mostly in “Direct” mode but occasionally I switch to other modes when playing simple stereo files or Videos with regular PCM encoded audio, and so far everything sounds OK.
I was trying to find out what the “normal” Format and Rate for HDMI Audio is, but it seems that there is not a single or unique value, and the 48000.0 Hz +“8ch-24bit Integer” is the right one to choose.
Regards