Your screenshot shows that you have selected an image (linked/embedded) and applied the White swatch to it.
Could you share the file with us (firstname.lastname@example.org) to take a look?
Adobe InDesign teamEmily Sandstrom commented
This was happening in CC 2017, was briefly fixed when I updated to 2019. But is now doing it again. Feels corrupt.Emily Sandstrom shared this idea ·