Nasdaq freeze

An anonymous correspondent explained last week's Nasdaq freeze thus.

The truth about what happened Aug 22 to the Nasdaq is that new limit-up/limit-down rules took effect in derivatives (exchange-traded products) listed at Arca at the same time that new options began trading marketwide that day. Since the market is full of complex, multi-leg trades, bad data propagated, affecting Goldman’s options-trading algorithms Tuesday, spawning hundreds of derivatives trading halts by VIX expirations Wednesday, and producing bad data in the consolidated tape by Thur, halting Nasdaq trading. So the real culprit was the SEC. But it’s bad form to say publicly that the regulator is responsible for jeopardizing the market.

I can't vouch for the story, or even for understanding it all. But I'm interested in several emerging stories that some trading pathologies are in part unintended consequences of SEC regulation. It's also not the first time I hear of financial market participants afraid to speak out and earn the disfavor of their regulator.