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Could it be the GUI is off the screen? If that is the case, then try the following to test it out.
Go to the settings directory which is C:\Users\XXXX\AppData\Roaming\Calibre and rename the file gui.json to gui.json.bak. Then run calibre again. If it shows up, that means the gui was off screen. BTW, XXXX is your Windows account directory name.
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