I have two different problems on an iMac with Mojave.
When i try to close Cuelux with the Powerbutton the App
ends unexpectedly.
After this the the lights won‘t switch off.
I have to start the app again, then all lights switch off.
Same problem with older version and also with Windows - PC.
The other problem is that the App starts always with the Options-Screen.
So i have to push the Options-Button to get to the normal mode.