Audio settings won't stick

When I first start XBMC it doesn't any sound. The reason is that the HDMI sound IF isn't recognized. After a restart of XBMC I can select HDMI in the System settings and then all is fine. This setting doesn't survive a standby and a restart of XBMC though - well at least not very often.

So
Start 1 (mostly) only one audio interface (SPDIF ..or so).
Start 2 .. SPDIF and HDMI audio (so after a selection of HDMI everything works well)

I hope this is understandable and enough information to get some feedback.

I am on the current XBMC relase (no dailies) and on Windows 8 Pro. I've had this since I was on Frodo .. so it's not just the newest release.