Disable AdBlock in your browser, and you’ll be able to access your reports again.
Edit: Another fix. When you access your GA page, you’ll see a URL like this:
https://ads.google.com/analytics/web/?hl=en#home/aBunchOfNumbersAndLetters/
Change the “ads” to “www”:
https://www.google.com/analytics/web/?hl=en#home/aBunchOfNumbersAndLetters/
That “ads” in the URL is triggering misbehavior by AdBlock