Guess I can add some more info.
I just found out that the files not playing are of mp3 256 kbps codec. That seems to differ them from most else that I checked out.
Besides from that, I have my PS3 connected to a logitech z5500 through optical, same as the xbox360; I just switch the optical cable.
Debug log shows nothing astray from normal, regular starts ans stops of the file from what I can see in comparison to all other mp3 plays, except that it won't play.
As this works on my 360, I can't come to think that this has anything to do with my PC in any way. Probably not the pms neither, but if anybody is familiar with these problems, solutions would be very much appreciated either way
, nope, found other files of same codec, played them, no problem at all. So what could actually be the problem then ?