[jz1276]

I was getting audio drop outs with dtsma until i selected "sync audio to playback" option now no more dropouts... no idea why this helped.

do you mean "sync playback to display" with "a/v sync method" set to audio clock? if so i sadly already have that set.

Yes sync playback to display is what I meant, but mine is set to Video clock (Resample audio), NOT Audio clock.
Here are my exact video settings... no more dropouts (at least with DTS-MA, I don't have any movies with a TrueHD track).

Render method- auto
Allow hardware acc- checked
Allow vdpau opengl interop checked
Allow vdpau opengl interop yuv checked
Allow hardware acc (xvba) checked
Adjust display refresh rate to match video- Unchecked
Pause during refresh rate to match video- off
Sync playback to display- checked
A/V sync method- video clock (resample audio)
Allowed error in aspect ratio to minimize black bars- None
Display 4:3 video as- Normal
VPAU Studio level color conversion- UNchecked
Activate teletext- checked

I have no idea what any of these settings do (except display 4:3 video as), but when playing DTS-MA tracks my receiver displays DTS-MA so I know the signal is being sent to my receiver unaltered.