Sound Issue with Videos on Halo Waypoint

The videos on Halo Waypoint play but there is no sound.

Before playing the videos-the Waypoint sounds are there, the navigations sounds, background/ambient sounds are there- but once a video is selected and buffers and loads- nothing. The system sounds return after stopping the video and then backing out to the Waypoint menus.

I have tried this with the new Behind the Scenes vids from Reach, Red vs. Blue videos, and others- all show the same behavior- sound is out as video loads, buffers, then plays.

This is happening on the New Limited Edition Halo Reach 360 console- so I did have to download Waypoint- so I think I covered the “try re-installing” solution/suggestion.

Anyone have similar problems and -more importantly- can anyone suggest some solutions?