Apple TV - Netflix - No Surround Sound

Hi All, first post!

I recently purchased Apple TV 3, it plugged into my Yamaha YSP 2200 via HDMI, soundbar then has HDMI out to my Toshiba LCD TV.

The issue I'm having is that Netflix doesn't play 5.1 through Apple TV. If I use Netflix on my Virgin Tivo box all is fine and I get surround sound. My soundbar has an indicator light that shows if surround is detected and glows either blue or orange. However through Apple TV no light appears and the sound is completeley different.

I have tried adjusting the settings for Dolby Digital, it is set to 'On' rather than 'Auto'. I have also tried messing with the audi options in netflix but it doeasn't show any options other than 'English'

The odd thing is.....I'm pretty sure it was playing in surround when I first got it, however I have since updated Apple TV and it seems to have stopped working after this update.

Just wondered if there is a known recent issue for not being able to get surround working with Netflix through Apple TV?

Thanks

Andy.