IMac won't recognise USB MIDI keyboard in Audio MIDI Setup

I upgraded earlier in the week from a G4 eMac to a new Intel iMac. All appeared well until I tried to use my Evolution MK-361 USB midi keyboard from inside Logic. No midi events were coming through the system.
After some fiddling around I found the Audio MIDI Setup utility and the keyboard is not listed as a device in there. However, if I open System Profiler and select the USB information I can see that the keyboard is connected. According to the E-Magic web site this model of keyboard is class compliant and so shouldn't need a driver installed.
Originally I had the keyboard plugged into a USB hub. I've tried restarting the machine, restarting the machine with the cable plugged into different USB ports and different USB cables plugged into different USB ports. I've also downloaded all the latest OS / firmware / application updates and installed them.
I reconnected the keyboard to my old eMac and it shows up on there so I know it's not a fault in the keyboard itself.
The only other bits of gear connected to the machine are a Lacie external hard drive and my Saffire but these are firewire device so I wouldn't expect them to cause a problem (they certainly didn't on the eMac).
If anyone has any ideas I would seriously appreciate the help. As you can imagine I'm pretty gutted having forked out a grand for the machine.
Cheers
Jon
iMac (Intel) Mac OS X (10.4.8)

Hi Jon
So much for plug and play
Yeah, it's great isn't it?
I emailed M-Audio tech support about it and apparently it's a known problem in 10.4.8 and they're waiting for a fix from Apple. I guess I'll just have to keep my eyes peeled for OS updates and go rummaging under the stairs for a midi cable instead.
Ho hum.
Jon

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