The sound stutters occasionally.
MP3 and 24-bit FLAC files seem to work ok. I used the three files of example 1, at the bottom of http://www.eclassical.com/pages/24-bit-faq.html to test this.
VLC 2.0.8 works ok on all three files.
I'm running Windows 7 64-bit. Both the 32-bit and 64-bit versions of VLC 2.1.1 for Windows have the same problem with the 16-bit FLAC file.