2020 Pages Window Broken
Ever since updating to Indesign 2020 the pages window just doesn't work. I've tried uninstalling and reinstalling a number of times but no matter what I do it just shows it as completely blank. This makes it extremely difficult to access anything, let alone my master pages.
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Have you tried trashing the Application’s cache and Preferences? Please try that and see if the issue goes away.
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Adobe InDesign team