I did the debug thing at command prompt and this came up
Microsoft Windows [Version 10.0.19042.1348]
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C:\Users\User>calibre-debug -g
calibre 5.34 embedded-python: True is64bit: False
Windows-10-10.0.19041 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '10', '10.0.19041')
Python 3.8.5
Windows: ('10', '10.0.19041', '', 'Multiprocessor Free')
Interface language: None
Turning on automatic hidpi scaling
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 102.04823529411765 x 102.66947368421053
Using calibre Qt style: True
Failed to contact running instance of calibre
Failed to connect to Listener at: \\.\pipe\CalibreGUI-Userx with error: QLocalSocket::connectToServer: Invalid name
Failed to contact running instance of calibre
C:\Users\User>
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