[Alchete]

Did you try playing several MKV's with HD audio?

I just tried playing everything in my test folder: mix of Dolby and DTS, Master-HD, HD-MA, etc. I pressed stop on each one and played them all back to back.

Everything played flawlessly.

I'm using a mini-HDMI to HDMI cable connected to my receiver. Audio is set to passthrough. My equipment is in my signature

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HASWELL NUC POWER CONSUMPTION

In case anyone is curious about the power draw of the new Haswell NUCs, I hooked mine up to a Kill-a-watt and measured.

i3 Haswell NUC (D34010WYK)
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IDLE (at XBMC main menu): 10-11W
PLAYING (software decoding): 13W
SUSPEND (XBMC power save setting): 6W

Pretty outstanding.

So, it draws 6W if left in a "suspend" state that turns off the display but can still be woken up by a press of the remote.