@WJCronon - try this - stop calibre, in config folder rename gui.json to gui.json.bak, start calibre and test.
If that fixes it you may lose a few UI settings, that you'll need to re-enter. If it doesn't fix it, stop calibre, delete gui.json and rename gui.json.bak to gui.json.
JSON files can be viewed with just about any text editor except Notepad - so if the above works you can look at the gui.json.bak to see what the settings were. I would advise against cut and paste, use the relevant Preferences dialogues to reestablish lost settings.
BR
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