The usual first troubleshooting step is to update your display adapter drivers (or to roll back 1 version if it started happening after updating the drivers).
OneNote for Windows 10 Black Boxes\Black Pixels
Avi Assayag
1
Reputation point
For some reason, this weird black pixels or rectangles is very persistent and even after I disabled hardware acceleration. Uninstall & re-install is still not working.
what gives Microsoft?