Property me therefore yet another device purchased, namely the now since 2014 latest version (WD TV HD Stream. Media Player). To my displeasure, without exception, without audio play sound with this unit all MOV files. Depends on the same TV, same connection. When exchanged on old device works fine. For display properly with the new device all JPG's. Have checked the Relasenotes. The "old" device the MOV problem was really already solved, the current device no indication in the relaese Notes.
My conclusion and recommendation: Depending on the device version you have, unfortunately, expect surprises. And just as in my case, I'm not happy. that MOV files with me now no longer work with clay. So be careful!