Yahoo's move into live video could have kneecapped startups like Justin.tv and Ustream.tv. Instead, its botched launch just proved that serving up streams is a harder business than it looks — and got Yahoo rivals like YouTube interested. We hear Ustream.tv is now leaning strongly against taking Microsoft's $50 million bid, and going with a top VC firm instead. Cofounder Brad Hunstable would only concede that "something is going on." Anothing thing going on: Yet another new boss. "Chuck Wallace is the CEO," Hunstable told Valleywag. Note the present tense. If Wallace is replaced in conjunction with a new round of funding, it would be the third time an investor has installed new management.