It's working, Yay. Apogee support advised me to DLoad the Osx 10.6.7 combo updater but i found out that this was not compatible with the MBP so as a last resort I re-installed the OS from the disk that came with the machine. I left the latest driver Sept09 for the duet on the machine. 45 mins later i plugged in the Duet and it was recognised by AMS and Logic.
Pass this on to anyone else who has the same prob.
Thanks guys for all your input.