Hi!
I have a Windows 10 64 bit computer, and most (around 3 times of every 4) of the times I quit Lightburn, it does not close: it is still on Task Manager, eating around 20% of my cpu. I have seen even 3 instances there.
Notice there is no laser atached, just LightBurn and the computer.
Now I hve to have Task Manager open and check it every time I quit LB.