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Under the Advanced tab of Sigil's General preferences section, try checking the "Disable GPU Acceleration of QtWebEngine/Preview" check box and restarting Sigil. Newer versions of Qt6 are leaving more and more graphics cards behind.
If that doesn't work, try creating a system environment variable called QSG_RHI_BACKEND and setting it's value to 'opengl' (without the quotes). You may need to restart for things to take effect.
Last edited by DiapDealer; 07-01-2025 at 08:13 AM.
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