Well, closing the RED5 window does not return to Media 100. I’m not saying that’s good, but that is how it is. So if you close that window by clicking on the red traffic light, you’re guaranteed to see the Media 100 busy dialog, and the menu bar will still have “File Edit Composition Track Filters Preview Tools Window Help” instead of the Media 100 menu bar items “File Edit View Program Track Tools Effects Media Windows”. At that point you can select “Quit Boris RED” to return to the NLE.