That is the plugin icon. This plugin uses Tk for graphics. My guess is Tk is either broken by Sequoia or the plugin's Tk window has opened underneath Sigil, or underneath the PluginRunner dialog or requires you to click on the plugins icon to bring its dialog window to the front.
This is why I never use the latest release of macOS as it invariably breaks things. I stay one full macOS version back.
Last edited by KevinH; 12-21-2024 at 10:00 PM.
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