UpFront Editor error (Pinwheel of death)

Hi support,
I've seen on the forms that a lot of people seem to be having this issue today,
So if you guys want take a look that would be greatly appreciated.
The site is a brand new WP multi-site, install on a Bitnami AWS T2 micro instance.

Chrome JS console:
The specified value '!' does not conform to the required format. The format is '#rrggbb' where rr, gg, bb are two-digit hexadecimal numbers.
/wp-includes/js/underscore.min.js:5 Uncaught SyntaxError: Unexpected token ?