I've the same symptom. Even with kernel 2.6.4 and the patch provided by Clemens. 
I own a Midisport 4x4. So it seems not to be model specific.
Initialzing is fine. But unplugin/replugin will request a reboot with sysrq 
intervention. 
First I've had enabled the USB 2.0 features on my motherboard with the same effect. 
But with the disadvantage not _receiving_ any MIDI messages. Sending was quite fine.
So I switched to USB 1.1 in the BIOS and receiving was been although possible.

Regards, Hartmut




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