i am freaking out since Max (both 5 and 6) starts but gives a error message in the max screen:
coremidi: couldn’t become a client.
I have already deleted midi plugin files from my library, and repaired permissions, but to no avail. Midi seemed to be working okay after repairing permissions, but alas the problem occured again after a day. Also, the application Audio MIDI setup is not able to load the MIDI window, keeps saying "Loading…".
Just tagging on here: If it helps anyone else with this, I had exactly the same problem & I suspect it was due to me installing a corrupted midi-driver during a recent concert. This page sorted it out: