Whenever Dash is open I can only hear sound through my Rift headphones and that's it.
Selecting any other audio device in the Windows 10 playback tab while Dash is open there is absolutely no sound being sent through that device.
This means I can't pin a window using Dash and then stream or record videos to share with sound. It also makes the mirror audio feature totally pointless when Dash is open. And I can't use a subpac, butt kicker, or any other set of headphones while Dash is open.