I have the exact same issues. I have updated the os to 10.14.6 plus security. Updated all 3rd party plugins. Checked for known issues with NI and followed those suggestions (turn off memory). I have deleted prefs and started from scratch. Matched all monitor resolutions. Up dated hardware firmware for Apollo x8 and MOTU midi time piece. Turned off all nonessential mac tasks. Spotlight. Siri. Font smoothing. Removed VST’s. Made sure all VST’s are 64 bit. Shut down. Restarted. I have sent videos of what’s been happening to support.
So you know I don’t think it’s hardware specific. If I double click several time on the main editor page spinning dial stops and I can enter another function like play then spinning starts again.
Tech support has been doing their best but no answers yet.
I am hoping to not lose another week of work over this.
I tried going back to 10.0 as I saved the preferences but that just crashes on start up now. So…ya.