Heya.
When using VLC with Livestreamer (http://docs.livestreamer.io/) it seems to have problems with source quality streams. Volume control breaks, often being extremely delayed or just doesnt register when trying to increase/decrease volume and fullscreen behaves the same way, most of the time not registering that you've tried to go fullscreen (or back to normal) or being extremely delayed in switching
Not all source streams have this problem as not everyone streams at the same quality so it seems to have problems when trying to play streams above a certain quality, twitch doesnt give resolution info on source streams so I don't actually know at which point it breaks.
Here are a few streams that I know it breaks on, but you could likely try it on any big channels stream and have the same issue.
http://www.twitch.tv/ssbmstuff
http://www.twitch.tv/5hizzle
http://www.twitch.tv/lirik
http://www.twitch.tv/nl_Kripp
The latest stable build doesn't have this problem.