USB audio interface not recognised

Hi, I've posted this in the power studio forum as well but it doesn't look very busy so I'm putting it here as well.. I'm having problems with Sonar 6 and the USB audio interface. It's showing up as an audio device but not as a midi device. I can't think why as it usually works. Thanks. I'm using windows vista. It's working fine as an external soundcard. Edit: fixed I think, pressed the 'advance' button...