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I reported a phantom window with PixPro as in the above case number. I thought that the window on my previous image might be running because of multiple instances of Pix Pro running, because when I ⌘Q'd the PixPro window the phantom rectangle remained and the apple menu said PixPro was still running ; ⌘Q again and the transparent window went away. But when I tried to replicate it the transparent window goes away too. The transparent window in this image, as before, is immovable but very selectable to foreground or background.