I am getting crazy... Did a clean instal onto a new SD card and the result is same, surround mapped to the front.
kszaq, could you help us?
I must say that I'm not getting this problem at all on a Venz Pro10 (S905X). I ran all the usual DD, DD+, DTS, AAC, TruHD videos and they play back correctly with all the correct channel placings. AAC is converted to PCM as usual (my AV amp, like many, does not support raw AAC). My multichannel FLAC (PCM) audio files are output correctly also. Would this be an issue with the conversion from DD variants to PCM in your case? I use passthrough for all the high-res audio formats as my amp supports them.
edit - just saw your second post. You seem to be using some kind of pseudo or auto surround mode on your AV amp.