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More info that might help narrow it down:
1. I initially only updated Calibre from 7.16 to 7.17. Even without updating anything else, 7.17 would not open.
2. Then I updated other packages but that didn't help.
3. Now I have re-installed 7.16 and it works fine.
My guess is that it's not QT because the older Calibre 7.16 works fine with updated everything, while the newer 7.17 doesn't work either before or after other things were updated.
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