Quick Time Player (10.2) wont start any video that I tried (mov & mp4) when using Virus TI Snow as the audio interface. Quick Time Player throws an error "...could not be opened. An unknown error occurred (-101)". In addition VLC wont output any sound but plays video just fine. Switching to internal speakers resolves all issues.
Oddly Quick Look works perfectly for the same media. System sounds work, iTunes and DAW (ableton) work perfectly. Bit weird.
Specs:
* Mac Mini OS X 10.8.5
* Virus TI Snow 5.0.2.01