When you have another app open on top of Orion, you can not close Orion's window by using the red x button. In order to close the window, you need to click elsewhere on Orion's window first.
For the red x button to close the Orion window when clicked, regardless of whether or not Orion is currently focused.
Version 0.99.130.2-beta (WebKit 621.1.2.111.4)
Sequoia (15)