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We have a setting in preferences to enable that, but if Sigil doesn't launch, it's hard to check the box. If the environment variable does the trick, though, the box can be ticked and the environment variable done away with.
One could also manually edit the Sigil ini (Sigil_v6.ini for Sigil 2+) and change disable_gpu=false to disable_gpu=true (or add disable_gpu=true if no entry exists) in the [user_preferences] section.
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