"Error to initialize Core MIDI" Logic Pro X with Mojave 10.14.6... again
This has been a known issue for a while now and I'm hoping Apple can take some solid steps to address it. For me, as it's been for many, it would seem, the update to Mojave has caused some serious issues with initializing Core MIDI when opening Logic Pro X. This is an issue that is persisting throughout updates to Logic and to OS X and it's becoming quite frustrating. It seemed to have gotten a LITTLE bit better with the last update (I would normally launch Logic once, receive the "Error to initialize" message, quit, re-launch Logic, and everything would be fine) but today it's much, much worse. I restarted my machine and Logic many times before MIDI started working. I also tried the workaround of launching Audio/MIDI setup before re-launching Logic, and that didn't work. Finally, after launching Logic seven or eight times, core MIDI initialized and now it's working.
I use Logic professionally and this is a giant time-waster. I love the software but I'm hesitant to continue updating OS X if these launch issues are going to get worse with each update. Esteemed Audio/MIDI engineers at Apple, I'm imploring you to look into these issues seriously, I know I'm not alone!
(For the sake of being thorough: my machine is a 2013 iMac that's still running like a champion after six years! My interface is a Steinberg UR-22, which I've been very happy with overall. I run one MIDI input into that from a Yamaha controller and a second MIDI input directly from the USB MIDI connection on an M-Audio Axiom Pro 61.)