The BE's may be getting enough power, but what about the Pi's themselves. How do you have them hooked up for power?
Both have 5V 1000mA power supplies
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You need 500mA per USB.
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All the Block Erupters are on powered hubs (Rosewill 5V 5A with 5 BE's and DLINK 5V 4A with 4 BE's), so they are all getting more than enough power). I see if I can find some 5V 2A power for the Raspberries.