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If you have Sigil 1.9.10, try *not* using the opengl environment variable, and instead launch Sigil and look through the Sigil General Preferences for a new setting to disable the GPU.
Check it to disable your gpu acceleration when using Preview. Completely shutdown Sigil after saving your Preferences (changing that preference requires Sigil to be restarted). Then try firing up Sigil again.
Does that help?
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