Thank you so much... that was a quick and easy fix. I wonder why that file was missing to begin with.
Out of curiosity, when I pick the same style, that instrument that wasn't working before starts with ** N/A ** (refer to screenshot). Is that because it wasn't found before? I have since restarted and it still shows "** N/A **".

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NA.png (9.07 KB, 34 downloads)