Failed to initialized audio device check your settings - DTS-HD MA

After upgrading to the last official firmware (1.5) I can't play MKV files with DTS-HD sound codec. The box shows the following error message: "failed to initialized audio device check your settings". And no sound is played anymore, even in menus, only coming back after a full reboot cycle
Setup:
Boxee Box -> HDMI -> HT DTS HD capable (Samsung HT-C5500) -> HDMI -> TV

Mediainfo:
Audio
ID : 2
Format : DTS
Format/Info : Digital Theater Systems
Format profile : MA / Core
Codec ID : A_DTS
Duration : 2h 9mn
Bit rate mode : Variable
Bit rate : 1 561 Kbps / 1 510 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Compression mode : Lossless / Lossy
Title : DDR
Language : English
Default : Yes
Forced : No