Usb audio interface isn't recognized by mac os 10.4.11 after reconnecting

Hi,
I use the native instruments audio 8 dj interface (1.2.0.020, driver 2.3.5, FW 23) with my macbook pro (mac os 10.4.11).
The audio 8 dj is only recognized by it's control panel when it's connected to the notebook via usb before the notebook is started.
When the notebook is already up and running and you connect the audio 8 dj it's not recognized by the notebook.
Also when you disconnect and reconnect the usb cable while the notebook is running the audio 8 dj is not recognized any more, although in all cases the usb led of the audio 8 dj is steady green.
Does anybody know which could be the reason for this problem?
If you need further information please let me know.
Best Regards,
Thorsten

I'm having the same problem on my new MacBook Pro 13", but in my case the issue is with a Sennheiser USB adapter (modelno UUSB2) that I use for my headset.
It's very annoying having to reboot each time I would disconnect and reconnect the device!
The Sennheiser adapter works fine on my older MacBook Pro 15", so it's not an hardware issue with the adapter itself. I've tried resetting the SMC and PRAM to no avail. Sennheiser does not provide any drivers, so it's not a third party driver-issue either. I've tried clean re-install of the OS as well without any luck.
The log-messages from Console.app start notifying me about this when I try to re-connect the device:
17.09.09 22.11.28 kernel USBF: 4037.829 AppleUSBOHCI[0x702a800]::Found a transaction which hasn't moved in 5 seconds on bus 0x6, timing out! (Addr: 0, EP: 0)
17.09.09 22.11.28 kernel USBF: 4037.928 [0x70f9600] The IOUSBFamily is having trouble enumerating a USB device that has been plugged in. It will keep retrying. (Port 2 of hub @ location: 0x6000000)
17.09.09 22.11.34 kernel USBF: 4043.829 AppleUSBOHCI[0x702a800]::Found a transaction which hasn't moved in 5 seconds on bus 0x6, timing out! (Addr: 0, EP: 0)
17.09.09 22.11.40 kernel USBF: 4049.830 AppleUSBOHCI[0x702a800]::Found a transaction which hasn't moved in 5 seconds on bus 0x6, timing out! (Addr: 0, EP: 0)
17.09.09 22.11.46 kernel USBF: 4055.830 AppleUSBOHCI[0x702a800]::Found a transaction which hasn't moved in 5 seconds on bus 0x6, timing out! (Addr: 0, EP: 0)
17.09.09 22.11.48 kernel USBF: 4058.330 [0x70f9600] The IOUSBFamily was not able to enumerate a device.

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Usb audio interface isn't recognized by mac os 10.4.11 after reconnecting

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