Thread: Issue with Calibre Viewer
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Old 05-31-2020, 10:43 PM   #3
kovidgoyal
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That's a video driver issue. Note that windows 7 is not supported with calibre 4 precisely for this issue. You can try various workrounds:

1) Update your video drivers
2) Turn off hardware acceleration https://doc.qt.io/qt-5/qtwebengine-debugging.html
3) Stay with calibre 3.48 till you are able to move off windows 7
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