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This is implausible, as it works for me, and I built the version of calibre under discussion on 3/08, while the current latest version of pyqt5 is 5.12-2, built on 2/10 (nearly a month earlier).
Possibly your PyQt5 version is out of date instead?
There are a bunch of Qt5 packages updated to 5.12.2-1 as of the 14th, but that shouldn't matter in this case. The progress indicator is not even linked to private headers...
Full details on all related package versions would be helpful.
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