Minimized window
A few days ago when I opened Calibre, I got a new icon in the start bar, but no apparent window. If I hover over that icon, it shows a small open window as with any other program. But, if I hover over that small window, which normally blanks all other open windows and shows the location of the window, this one just blanks the screen and shows nothing. If I right click over that small window and pick maximize, then Calibre opens full screen, but if I then click to take it back out of full screen, it just disappears again. I have had other applications reduce themselves to a minimal bar which one can painfully then expand back to a full window, but here there is nothing.
I am running 4.6.0
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