HDMI Digital audio speaker output - Has anyone else seen this happen?

I had a number of audio sync problems. (Win8/64Pro, 3770k, NO video card - running quicksync, PD11v2516, latest intel video driver).
What I discovered is that PD11 gets rather confused if I select the audio output via digital output via HDMI or Displayport on the motherboard. I found 2 sec to 1 min delays in audio after rendering, even though the clip played fine in the timeline preview. The delay was not constant over the entire clip either. And sometimes, also I had no audio when previewing the clips on the timeline. I even bothered to adjust a rendered clip in the timeline to re-align the audio, and then re-render, and the audio sync problem re-appeared!

I tried disabling the motherboard on-board realtek audio via windows device manager, thinking that there might be a driver conflict, but that resulted in files rendered with that deep, slow 1/2 or less speed sound like a record playing wayyy too slow.

What I did was to set the speaker output to the analog out on the onboard audio so that the audio was NOT being directed thru the HDMI/Dport output. ( I am referring to the windows icon usually at the lower right of the screen where you can select the output for the speakers - I used that tool to choose the output for the speakers - I chose 'playback devices - speakers, - - and did NOT select anything digital audio. I now use headphones plugged in to the motherboard audio output jack to listen.)

Audio sync is GOOD now. I do not know why, but PD11 does get confused during rendering on my setup if I select audio out via HDMI/Dport.

Is there a way to get output via digital out and still maintain audio sync?