Rinse and Repeat
I've had the same problems for roughly as long. It fixed itself, then not. I tried using adblocker, then disabling it.. nothing. Essentially, Livestream works whenever it wants, but does not want to work most of the time.
This is a bit of a piss-off, as the majority of the people I know use this site.
I want to make it clear that Twitch.tv and Ustream? Work perfectly fine for me. This isn't some sort of power play or anything retarded, but if all of us are having this problem, it seemingly comes from Livestream, and if it could be fixed or at LEAST identified, it would be good.