How would I add and configure the NSVisualEffects view? There is a lot going on, e.g. the blurring starts below the toolbar.

here are two screenshots: This one shows the proper blurring: and here you can see how the drawing is much more visible (the gray bar below the toolbar is a tab bar in a NSTitlebarAccessoryViewController)

This is a different occurrence but the important part is the same. I have all kind of them. It doesn't really matter where the userdefaults are set. userdefaults.crash