@leeper - you can find the calibre configuration folder via Preferences->Miscellaneous->Open configuration directory. If you then close calibre and rename the directory to <whatever>_save, then when you restart calibre it will take you through the welcome wizard. After hooking up your existing library you can test by setting up and running the catalogue.
If that works you'd need close calibre, and edit the gui.json file in <whatever_save> to remove the catalog generation settings, before reinstating <whatever_save> as the original configuration folder.
I don't know enough about catalogue generation to suggest what you'd need to remove.
BR
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