I was going through a list of themes to test them out on the new WP version and when I got to a theme called Danko it broke the site:
Fatal error: Cannot redeclare _verify_isactivate_widgets() (previously declared in /home/username/public_html/wprc/wp-content/themes/danko/functions.php:229) in /home/username/public_html/wprc/wp-content/themes/danko/admin/functions.php on line 585
Tried to go back and click anything else and I get the same error.
I have the plugins Wordfence and Antivirus activated. Wordfence doesn't work since it doesn't recognize this WP version. Antivirus seems to work. I created an about page using the new feature- no images just text in the text box and there is the sample page up. Otherwise bare bones.
Hope that helps someone ;)