"Adjust Refresh Rate to match video" Surround channel mapping.

I tried looking for the reasons behind this error but couldnt seem to find anything dealing with the same correlations. My Surround Sound channel mapping works fine until I turn on the option, "Adjust Refresh Rate to Match Video". Its fine again when I turn it off. It has me pretty stumped. I can leave the option off but doing so makes the video a bit jittery.

The video files im playing are .MKV's using x264 codec, with 5.1 - 16bit Flac Sound.

Any help would be greatly appreciated. If I missed a thread dealing with this, I apologize.

I am running XBMC Live Dharma RC1 on a HTPC with a Zotac Ion 330 motherboard. 4GB or RAM. Using Nvidia 260 drivers. Hooked up to a Harmon Kardon receiver via HDMI then to a Sony Bravia LCD TV.

Please read: http://forum.xbmc.org/showthread.php?tid=34655
A lot more information is needed to help you further.