Midisport Uno stopped working after installing Snow Leopard

Hi
I have been happily using the midisport uno USB to connect my Roland PC-200 keyboard to my iMac.
Yesterday I installed Snow Leopard (I figured it was about time) and while MBox 2 is still fine for audio input, I'm unable to detect any midi signals via my Uno.
Nothing shows up in the ASM, even though I have re-installed the Uno and downloaded the latest driver for it (v3.4.0 for 64 bit)
I can see the lights functioning so the keyboard is sending a midi signal, but for some reason my computer cannot detect it. I have tried plugging the USB directly into the iMac (despite the fact that previously it was working fine via a USB hub)
As a control test, I plugged the Uno and the keyboard into an old Macbook - they worked first time. So the Uno and the keyboard are fine.
Any help gratefully received!
Andy
iMac (Intel 2 duo core) running Snow Leopard (10.6.8)
Roland PC-200 keyboard
Midisport Uno 1x1 USB

Go to the HP web site and download the latest drivers for your OfficeJet.
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=219&lc=en&cc=us&dlc=en&sw _lang=&product=3919449#N225

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