I would first suggest disconnecting the KB37 from your computer and running the Line 6 Driver Uninstaller located in:
After you complete the driver uninstaller, trash the Line6 folder.
Then download and re-install either the POD Farm 1.11 or Gearbox 3.70 installer from:
Make sure to install the software and to test all of the USB ports on your Macbook Pro. Do not connect a USB hub to the computer.