Upgraded to v2.0 - audio and video out of sync on external preview

OK.

I was running 1.8 with no problem, updated to 2.0 and now my fcp timeline doesn't play in sync. (external previewing)

I had it at a 4 frame offset in my system settings, which it retained. Playing the same sequence that was working before the update.

I'm running HDSDI out to monitor...and balanced audio stereo to a mixer running to monitors.

Is there anything that I can adjust? I've adjusted frame offset but can't seem to get it right...I've gone through the matrox settings in sys prefs and not found anything?

Anyone experience anything similar?