WD live Tv (GEN3) No play soun on mkv

Hi blue_scape, what firmware version do you have installed?

List of compatible media file types for all WD TV and WD Elements Play Products

http://wdc.custhelp.com/app/answers/detail/a_id/2698

How to automatically or manually update the firmware on a WD TV Live Hub Media Center or WD TV Live Streaming Media Player

http://wdc.custhelp.com/app/answers/detail/a_id/5749