When I converted to Mac a few weeks ago (24" C2D iMac), I took the Huey with me. Updated to the latest Mac version, installed software, plugged it in, and all was fine. Except... after the initial calibration, the software can no longer find the sensor. If I uninstall the software and reinstall it, the sensor's back; but once I shut the machine down and start up again and run the calibration, it tells me "Sensor not found". The Huey is plugged straight into one of the USB ports on the back, not through a hub. Any ideas?