If the 828mk2 or Traveler is not appearing as a MIDI device in OS X's Audio MIDI Setup utility, there is a good chance that your interface was turned on during driver installation. As specified in the driver installation instructions, the interface must be turned off during installation. It is also a good idea to make sure you have the latest drivers available.

Instructions for reinstalling the drivers:
1. Turn the interface off.

2. Launch the installer and choose Uninstall from the install drop down menu in the upper left hand corner of the window. Once this is complete quit the installer.

3. Go to MacHD/Users/Library/Preferences, locate the files named com.motu.firewire.CueMix.console.plist, com.motu.firewire.SMPTE.console.plist, com.motu.FireWireAuio, and MOTU FireWire Console.prefs, move them to the trash and empty the trash.

4. Go to MacHD/Applications and make sure the MOTU FireWire Audio Console, FireWire CueMix Console and FireWire SMPTE Console are no longer there. It they are still there, move them to the trash and empty the trash.

5. Restart the computer. Launch the installer and install the Consoles and Drivers for the 828MK2 or Traveler. Once the installer is complete, restart the computer. Do not turn the interface on untill the OS is fully booted with all drivers and icons mounted on the desktop.