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The fix is here: https://github.com/processing/processing/issues/4747
It's because of a font clash between Source Sans and Source Sans Pro. the workaround is to delete Source Sans Pro.
some code to check if you have the suspect font installed:
import java.awt.Font; Font f1 = new Font("Source Sans Pro", Font.PLAIN, 12); Font f2 = new Font("Source Sans Pro Semibold", Font.PLAIN, 12); println(f1.getPSName() + " ... " + f2.getPSName());
When the font is installed, it'll print SourceSansPro-Regular ... SourceSansPro-Semibold. When not installed, it'll print Dialog.plain ... Dialog.plain.