I have reinstalled now the Version 10 to the harddisk to be sure that i have a clean install without any config mistakes from my side. Wha i have done :
1. Boot from CD, choose install to disk
2. Let the system install to the disk
3. Reboot, XBMC start from Harddisk
4. Go to System - System - Audio
Adjust the Values like this :
Audio output : Digital
Dolby Digital (AC3) cabable receiver = disabled
DTS Cabable Receiver = disabled
Audio output device = hdmi
Passthrough output device = hdmi
Downmix multichannel audio to stereo = enabled
5. Go back to Videos and play a video file from my usb stick
Result = NO Audio
If i do the same from the Live System it works properly and i have Audio. Any idea what can be this nasty issue ?
Update : I have now enabled Debbuging, and here is the logfile :
http://pastebin.com/f7fd07610
Hope Somebody can help me with this issue