I have an original M-Box (2007) came with Pro Tools. Loaned it & just got it back. Found iLok software and digidesigh Core Audio 7.4.2 drivers. Installed & Audacity works perfect with the M-Box. garageBand does the following.
1. takes about 15 sec & activity monitor show re 'not rsponding'
2. After 5 minutes GB loads & looks OK 9select start a get tracks etc.
3. Then get "MIDI timeout' & GB starts taking 100% CPU resources & just hangs.
4. I force quit GB
5. Removed all of the Digidesign drivers.
6 get same 1-5 above. M-Box is Not connected. Tried re-install GB tried shut down, etc.