I had an Axiom-49 MIDI controller plugged into my Mac with a MIDI to USB cable, and everything was working great. I was trying to add a Roland digital drum kit into the setup and plugged its MIDI out into the Axiom's MIDI in.
Everything promptly went to hell. I've since unplugged that and turned everything off and on, but now only four of the keys on the keyboard work (make a sound in Logic): the top G#, A, A#, and B (only in the top octave on the physical keyboard).
I've tried plugging another controller in (an M-Audio Keystation) and it produces no sound either, so the problem is ... in Logic? In the computer's MIDI configuration? Help!