Hi all.
Started this thread ages ago. My QC eventually got shipped off to Neural HQ. It’s now back and works perfectly.
Neural said on my unit: The issue was related to the processor unit, and also the storage unit, so our team replaced these parts.
If nothing works on your QC’s as a fix it’s probably a hardware issue like mine unfortunately.
@GraemeW thanks for the update. Sadly I think this might be the situation I am in. I’ve already had my QC sent back to Neural 1 year ago when the USB port failed completely. Hoping I don’t have to do it again. It’s weird that I can run my MacBook audio through the QC for playing along to tracks via headphones etc but anything to do with using Cortex Control is just a non-starter. 
Can you try to disable audio going to your monitor(s)? Is there a conflict occurring?
This is definitely a macOS Sonoma 14.2 issue from what I can tell.
Got out my old MacBook Pro which is 2 major OS releases behind - 12.4 Monterey.
Used the exact same USB dongle and cable and Cortex Control worked perfectly first time.
Took the same cable and switched to my current laptop running Sonoma - Cortex Control just hangs on the “loading presets” screen and either crashes or I have to restart/kill it. Never worked since the OS update that I can recall.
Please Neural can you help? I don’t want to use a 5+ year old MacBook Pro just to use Cortex Control
i got same issue.
M3 and Window is not working.
i try reinstall but not working.
how can i do ?
Reach out to support@neuraldsp.com as they can help you best with these specific issues