Dropped Midi Notes Cubase 6 Mac with M-audio uno

I am using a macbook pro running OS10.6 and cubase 6.03. I was getting my midi input through a presonous project interface, but I sold that and bought an Apogee Duet for audio interface and bought an M-Audio Uno 1x1 for midi input. it works but consistantly drops notes and has hanging notes. I’ve downloaded the driver from M-audio for my OS, but it doesn’t help.

Any ideas on how to fix this?