No sound in DX11 Mode

Before 3.1, I had no troubles getting sound from any of my output devices. I know it has been an ongoing issue that USB based sound followed the "Windows Default" rules. I have already tested switching between my G930 head phones (which have worked without a hitch until now) and my speakers.

In DX11 sound works for my speakers. In DX11, sound does not work for my head phones. I have switched defaults and restarted the client many times, checked all pertaining hardware drivers, no luck with the G930s.

In DX9, sound works normally (head phones and speakers).