hjr0
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hjr0
And there is no response when I knock up and down arrows with preview windows open. However, left and right do work.
Turns out to be erroneous biber cache: [https://tex.stackexchange.com/questions/543837/very-strange-error-suddenly-appeared-running-biber](url) Simply run `rm -rf $(biber --cache)` in Mac Terminal will do. Cheers!