How to delete a "library"

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Always make your own topic instead of piggybacking. If your issue matches exactly, the solution is likely similar. Asking new questions in an old thread is not a great way to get help. I tend to look for zero-post questions and happened to stumble across this one.

1. Remove the library entirely, add a new library with the correct path. Only time I modify a library with regard to paths is to add paths to new storage locations.
2. The likely culprit is not following naming conventions set forth in the documentation.
3. Enable/disable metadata providers as you see fit or, as you said, manually change the images.