The Transport Stream demos available at Dolby's site won't pass the digital audio correctly to my receiver.
I'm able to play all of the same TS files with Windows Media Play and have the audio passed to my receiver with no issues.
This is what leads me to believe this is a bug within VLC specific to TS files.
I'm running VLC 2.1.4 64-bit on Windows 7 Ultimate. The audio output device is the HDMI output on my AMD Radeon 5670.