Cubase 15 not opening Spins on Coremidi on Mac Tahoe

Cubase
1

Mac tahoe 26.3 Cubase 15 artist not opening Spins on Coremidi

2

Hi and welcome to the forum,

What kind of MIDI Device(s)/hardware do you use? Does it happen also if you unplug all your MIDI hardware?

Could you try to reset the Coremidi on the system level?

3

I’m using native instruments plugin with a Yamaha keyboard and tascam 4x4 interface, don’t see how to reset core midi internally, thanks still spinning

4

Hi,

1. Quick reset: restart CoreMIDI

This is usually enough if you just get occasional “CoreMIDI initialization” errors in DAWs.

  1. Open Activity Monitor (Spotlight → type “Activity Monitor”).
  2. In the search field, type: coremidi.
  3. Select the coremidi process.
  4. Click the X button (Force Quit).
  5. macOS will automatically restart the CoreMIDI service the next time it is needed.

You can also just reboot macOS, which reloads the CoreMIDI subsystem and drivers.

2. Reset MIDI configuration (Audio MIDI Setup)

If devices are missing, duplicated, or MIDI Studio freezes, reset the configuration:

  1. Open Audio MIDI Setup (in Applications → Utilities).
  2. In the menu, go to Window → Show MIDI Studio.
  3. In the MIDI Studio window, delete any ghost/offline devices by selecting them and pressing Backspace/Delete.
  4. Use the Rescan MIDI (refresh) button if available or unplug/replug the MIDI hardware.
  5. Quit Audio MIDI Setup and your DAW, then reopen them.

If MIDI Studio itself hangs or CoreMIDI won’t initialize, booting once into Safe Mode, opening MIDI Studio, then rebooting normally has fixed persistent issues for some users.

3. Deeper reset: remove CoreMIDI drivers

If the service completely fails after OS migration or driver mess (e.g., old drivers from Migration Assistant), a hard reset of MIDI drivers can help, but it’s invasive.

  1. Disconnect all MIDI interfaces/devices.
  2. Open Terminal.
  3. Run (you’ll be prompted for admin password): sudo rm -rf /Library/Audio/MIDI\ Drivers/*
  4. Optionally also inspect:
  • /Library/Audio/MIDI Devices
  • ~/Library/Audio/MIDI Drivers
  • ~/Library/Audio/MIDI Devicesand remove only obviously third‑party stuff you intend to reinstall.
  1. Reboot macOS.
  2. Reinstall only the latest versions of required MIDI interface drivers (M-Audio, Yamaha, etc.).

Be careful: this wipes third‑party MIDI drivers, so you must be ready to reinstall them afterward.

4. When it’s still broken

If after all of this you still see “Could not connect to CoreMIDI” on every boot or DAW launch, it usually points to:

  • A corrupted third‑party MIDI driver.
  • A problematic system cleaning/tuning tool that modified low‑level components.
  • Rarely, a system install that needs a full wipe‑and‑reinstall (“nuke and pave”).

In those cases, systematically uninstalling suspect tools/drivers or, as a last resort, reinstalling macOS and DAW cleanly is often the only reliable fix.

5

Thanks for the reply, In show midi studio, the icon spins doesn’t open, In Activity monitor there is core audio set up, no coremidi that I see, haven’t tried the deeper reboot
Heath

6

Hi there!

Just reboot your mac, it should help!

I had the same problem and no Coremidi in Activity monitor.
Just rebooted it, and now it works fast again!