I've been running on W8 Consumer Preview since release without any trouble at all. Yesterday I installed the Release Preview and I've encountered a problem. My PC outputs to the amplifier via HDMI on my graphic card (Radeon HD 6700). The problem is that in the speaker configuration from playback devices only allows me to select 2 channel audio, and has no option for 5.1, so anything which tries to play 5.1 audio will result in no sound output.
I've installed the latest release of the Catalyst Control Center released 31 May (for Windows 8 RP). This was all working perfectly under the Consumer Preview.
Any idea how to get it to work?
Edit: I know HDMI is not selected as default device in the screenshot above. That's not an issue as XBMC always outputs from HDMI irrespective of my default choice.