No sound with HDMI since recent software update

Model Number: R010.070.58.06P
Version Number: 4f3102

Hi SkyUser gurus

On Tuesday 09th September 2014 an auto update was applied to our sky HD box. Since then sound via HDMI has stopped working. Also some recordings have been missed (thanks for the great software Sky!)

I guess it's not all bad news as the EPG has been updated!!! However I would take system stability over features that screw up functionality! Perhaps Sky could thoroughly soak test software updates before unleashing their dodgy software on their suckers, sorry, I mean customers. Okay, rant over!!!

My Sky HD box is connected directly to my LG 42" TV via HDMI

Here's what I've tested:

1. Connected Sky box to TV via HDMI with three new cables, still no sound (I think that safely proves it's not the cable!)
2. TV sound still works fine connected to Xbox, this verifies the issue is not with the TV
3. Sky box to TV via SCART cable does give sound (but a terrible picture!)

I work in IT so know software updates can cause stability issues with hardware.

Can anyone tell me:

• if recent software updates can cause issues as described here?
• if it's possible to roll back the firmware version of the Sky box as I think the recent update has caused the problem?
• is there something else I can try to get HDMI sound back?

Thanks in advance