I hope this is not the answer as this was not an issue before the FW update, I have over 300 movies and re-encoding formats is not the answer at this point.
WD Support please look into the issue futher and please come up with a fix.
I’m using FW 3.0 and yesterday I lost ALL the audio. It didn’t matter what I played through the Hub there was no audio. Once I determined it wasn’t my surround sound system letting me down I had to do a full reset of the hub from the settings menu to get the audio back. I still don’t know why this happened…but I’m listening and making mental notes about what I do on the Hub so if it happens again maybe I can pinpoint what caused it.
I am having similiar issues as you are. I just ended up going back to stereo only on the audio output. No dolby digital even though the unit shows it when bringing up the informaiton.
As was posted earlier, Downgrade the firmware to 2.8xx then upgrade to 3.00.28 and the problem will be fixed, I had the same problem and I fixed it the day of the firmware update by doing this so I know it works. So far it looks like this is the only waty to fix it so far but was assured by WD it will be fixed on next firmware update.
Very easy fix so that is why you haven’t seen too many complaints, I just thought it was a glitch and that is why I rolled it back then reinstalled and many others probably did the same, I know I couldn’t be without my DTS for an hour let alone weeks as you have said.