Pink Rigging Accident
And that's pretty clear since you can see two people pulling two of the flying lines back towards the stage after her fall.
Glad she's OK, but I hope they get to the bottom of what happened. With that many lines to her harness, it has to be an automated system, but this looks more like a procedural failure than a technical one. It sure looks like she gave a "stop" signal--looking stage right and the crossed hands at about :47 in the video. Mark Fisher's Stufish studio designed the show, and Summit Steel supplied rigging, but I'm not sure if they provided the acrobatic rigging as well.
If anyone has details, please post a comment.
Update
on 2010-07-17 04:45 by controlgeek
I heard from a source that this is a Stage Technologies system, but it sure seems like an operator issue to me (and everyone else who I've talked to about it). The crossed arms is also apparently the Cirque "no go" sign.
Update
on 2010-07-23 12:04 by controlgeek
"Anne" (who didn't leave her name or any contact info), posted this youtube video with another angle and a much clearer shot: