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I would uninstall this completely to make sure, restart clear cache and try again. That plugin is deprecated I think since post previews can be set from core now.
Is the forum public can we take a look?
How to remove the "create gist" and "view archives" buttons at the button? I am running latest npm release 0.3.4 (should I use something else? strangely, I seem to remember a few years ago this was possible.)