CoreMidi not loading after macOS upgrade

I'm having an issue with CoreMidi. It seems to not be loading ever since I upgraded to Tahoe this week (Oct 20, 2026). Audio Midi setup is not functional and can't reset. Core midi doesn't show up in Activity Monitor. When Audio Midi setup doesn't get stuck loading, non of my devices have ports available.

I reset the computer and went back to Sequoia (15.8), problem came back after I reloaded files from my backup. Reset computer again, downloaded Pro tools and Live 12 from their respective sites. All was fine until I migrated some files from back up. Everything works except to midi information can be received by the computer.

I'm going to reset again and only download new versions.

Spoke to Apple tech, jumped through all of their hoops, no solution. Any help would be welcomed.

thanks

Vince

Posted on Oct 22, 2026 4:04 PM

1 reply

HWTech

Level 9 (78,350 points)

Oct 23, 2026 10:44 AM in response to vvgearboy

vvgearboy wrote:

I reset the computer and went back to Sequoia (15.8), problem came back after I reloaded files from my backup Reset computer again, downloaded Pro tools and Live 12 from their respective sites. All was fine until I migrated some files from back up.

I see a pattern here (highlighted the relevant portion). Seems you are transferring something from your backup which ends up breaking things. Most likely some configuration file for the hardware or software involved with your third party audio products.

Most likely if it is a configuration file associated with the hardware or software for your audio products, then deleting that configuration file/folder may resolve your problem. Make sure any related software is completely closed before deleting anything. Depending on what is deleted it may be worthwhile to log out or even reboot afterwards.