I reported this Space audio issue in the summer, and Shaw sent a tech to take a look. I have a DCX3400, and he tried a new unit (same model). Still same problem. He called in to dispatch, and apparently Shaw HQ knew about this affecting a "minority" of customers so it was not high on their priority list for repairing in the system. The tech apologized, and suggested that I just connect the cable directly to the TV. That's not a viable solution to me. he couldn't give a timeline as to when Shaw would fix this issue.
I emailed Customer Service this month to see if anything had changed (knowing that the audio problem itself hadn't, after checking). They offered to send a tech out, but there'e no point if it's a back-end problem.
It's annoying to me because I used to watch Space a lot, and would love to see it in HD (though that would be pointless unless I watch in mute!). Of course, my wife doesn't mind at all because she hates SF and this situation allows us to survive with one TV. LOL. But the point is, I want Shaw to fix this audio problem!