Hello,

  You can download all Line 6 drivers from the following link:

  http://line6.com/software/

  The driver version you are looking for is 5.1.2.

  Try downloading and installing that driver and let me know if you continue to have any connection issues. Thanks.

  Line6Miller

Hey I'm having the same issue, except it my macbook pro running mt. lion still won't recognize my toneport even after downloading the driver.  Line6 Monkey isn;t detecting any hardware either.  The unit is getting power when plugged in and has worked before on my last computer. Any idear what it could be? Thanks- DSTAL