Can't set 'Blank' on Second display

I've found that I can't set the second display to be plain blank, it still shows images the same as if it was set to 'Alternate'. I can set it to Desktop, but I prefer it to be plain black at times and not be a distraction.
Anybody else got this?
(yes, I've sent a feedback)

The implementation of dual display modes is ... indecipherable. It works, it just doesn't work in a way that I've been able to make sense of. The modes themselves are odd, the times when one can access the modes are odd, the changes in both of those betw. regular (windowed) and full-screen behavior are odd, and don't even start to think about how Aperture handles dual displays when you move the main window to your secondary display.
Here is what works for me, for "Blank" mode.
. Keep Aperture on your main display.
. Keep Aperture in regular (windowed) mode.
. Change to Browser view (not Split View or Viewer)
. "View→Secondary Viewer (note the wording!)→Blank" should now be available. Select it. Your second monitor should go blank (mine shows an 18% gray, but that could be my desktop setting).
Here's where it gets exciting. If you select an image in the Browser, the secondary viewer (usually) stays blank. If you double-click and change to Viewer mode, the secondary viewer stays blank. If you now double-click and return to browser mode, the selected image is shown on the secondary viewer even though "View→Secondary Viewer→Blank" is still selected. Press "v" to change to Split view, and the secondary viewer returns to a blank display. As long as you alternate betw. Viewer and Split views, the secondary viewer will remain blank. As soon as you switch to Browser, the selected images will show on the secondary viewer.
The take-away is
1. "Blank" doesn't really work, and
2. If the selections for Secondary Viewer are grayed-out, change to Browser view and try them again.

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Can't set 'Blank' on Second display

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