A Boxee developer on AVSForum indicated the change was due to a licensing agreement between the manufacturer of the box, D-Link, and Dolby, and would need to be left up to them for a fix. We've reached out to both Boxee and D-Link for word on their issue and while we haven't received a detailed response (expect more information tomorrow at the earliest), there is a notation on the JIRA bug tracker for the issue by "yuvalt" indicating the team is working on a fix for this and other issues which will hopefully be available within days. Check out the forum threads for more detail on the issue as well as temporary workarounds, we'll let you know if we get an official response on why this is happening and if / when there's a fix incoming.
Update: Per Boxee VP of Marketing Andrew Kippen, the problem was the result of a "miscommunication" and a fixed update for that and the volume control toggle will roll out this week. Check after the break for his words verbatim, but owners of the Box can rest easy knowing their surrounds will be back to work shortly.
specifics of the new sound processing implemented in this version.
We have fixed the issue and it will be part of the version rolling out
to users this week. We are also including a new Setting that will
enable users to decide whether they want to control volume using Boxee