Middle C note will not play????? please help

Hi Seth,
your question is a little confusing.

Are you hitting "octave up or down" on your keyboard?
Does every note behave erratically like this, or just "middle C"?
What are you trying to achieve musically with this?

Please update your profile to include the Logic version, computer model and operating system you are running.

That will help us a lot to answer your question.

Have you been assigning controller keys or knobs? I once did some assigning of controller knobs, and accidently assigned my middle C to a plug in function. It stopped making notes, and doing weird stuff. Took me a while to figure out what had happened.

Check that you haven't inadvertedly:

- assigned your MIDI note to a key command. Open the key commands window and check for any key commands that have a MIDI assignment

- turned "MIDI Remote" on with a trigger note of middle C (in your preferences)

- assigned your MIDI note in the controller assignments window

If you've checked all that, the next thing to do would be to close all songs, and select File -> New Song while holding Option (might be shift or control, I forget offhand). This will rebuild a new default song. Does Logic still exhibit the wonky middle C behaviour now? If not, then it was probably something in your environment of your existing songs, so that will give you a clue where to look.

If it still does it, trash your preferences and control surface preferences and restart Logic. The behaviour should have definitely gone now, indicating the offender was in the preferences somewhere that you may have missed.

When you've done all that, get back to us 😉