The "hideCursor()" method seems to have a problem on the Mac. Not only does it hide the mouse cursor when it is over the Cinder application's window, but it also hides the mouse cursor when it is outside of it. While the application window is on the foreground, there's no mouse pointer, period.
This makes it a bit difficult to hit the close button in the titlebar... :)
On Windows it works correctly (only hides the cursor when it is over the application's window).