Normal
I had a simular problem when I first setup MP audio decoder with SAF codecs. To solve thos problems I installed SAF 6 (enabled LAV and FFdshow audio codecs). I use FFdshow for AC3 (with recommended settings) and use LAV for DTS decoding (for me this works fine!). It works fine and all 5.1 speakers are fed with sound, nicely in sync with my 50HZ TV. I'm not sure if I had to tune any of the registry settings.
