Hello all, sorry to dig up an old thread but I thought it would be better than starting a new one.
I've recently been hitting this error as well. It happened yesterday on Spine 4.2.29, running MacOS 14.4. I upgraded to MacOS 14.5 just in case and that seemed to fix it. However booting up my machine this morning I'm getting the same error again.
I've tried deleting settings but no luck there. Based on the posts above I wondered if it had anything to do with external monitors but unplugging everything has no effect. I've emailed through my spine.log in case that's any use. I have no antivirus on and Spine has been working perfectly until yesterday!
If there's anything I can do to help track this bug down please let me know and I'll be happy to assist.