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For what it may be worth, on my desktop with Windows 11 24H2 26100.4652 with NVidia graphics card, calibre 8.7 comes up happily. On a VM install, Windows 11 24H2 26120.4733 (Beta channel), I needed to add QT_OPENGL=software and QTWEBENGINE_CHROMIUM_FLAGS=--disable-gpu to the system environment variables. I suspect this is due to conflicts between the emulated graphics card and what QT expects.
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