Weird thing now, probably a bug? On macOS, if I click play, then hide the window, go to another application/tab, and try to force quit the application (Say I'm in a browser, decide to force quit it with shortcut, muffon is hidden), instead of the application I'm in to quit, muffon quits, and it happens even if I don't have any windows open... It happens in version 2.1.0, version 2.0.3 doesn't have that issue.