When I play HotS the Plays.tv app crashes as soon as the match starts. I can sit in character select and it records fine. But once a match starts at the end of the loading window plays.tv stops. I have a library full of 4 minute videos that end at the loading screen of my first match.
@Thanory - Could be an encoding issue when switching to actual gameplay. I responded to your ticket requesting logs. Perhaps we can figure this out.
(I recorded HotS last night, so it doesn't seem to be a wide-spread issue involving that game)