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I have some short USB 2.0 extension cables that I use to plug between the Macbook and USB 3 devices - to reduce them to USB 2.0. Because if I for example try to copy more than a few MB to a USB 3 external HD, the Mac freezes. Every single time. So that's working well then.

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Try different powered hubs. Last week I discovered a USB key that eats so much power it won't run without a powered hub! Numerous external hard drives and optical drives are in this camp, too.

Does the power requirement change between USB 2.0 and USB 3? If not, I don't see why more power would change anything.

I also don't think a power problem on an attached USB device should give my computer a kernel panic.

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