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Unexpected USB behavior in new Powerbook

I am developing a high speed device which will work primarily with macs. I have been using as test hosts a PC and my old powerbook 17" 1.33Ghz. Whenever there was any problem in negotiation or setup/enumeration, i could just unplug the device, fix the bug and the plug it back in and the computer attempted to enumerate as normal. This is also the way it works with the PC.

However, I just purchased a new powerbook 17" 1.67Ghz. Now, whenever my device does not respond correctly or there is any problem in enumeration, when i disconnect the device and connect it again, the port is 'frozen' and doesn't do anything at all. I've tried other devices and port will not work with anything. I have to reboot the entire system for it to work again.

I've tried the exact same device on the PC, and it has no problem attempting enumeration again simply by unplugging it and plugging it back in.

Are there any changes in the hardware/software of this new powerbook that could cause this? I had the latest upgrade of OSX on my old powerbook, i was under the impression that the software is the same on this machine. Maybe the USB controller/phy are different now?

Thanks!
Juan

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