What's happening with Beta Theme Editor?

hlee2
Community Novice

Anyone experienced the Beta's new UI suddenly lost all styles? It looked like the browser couldn't render CSS files.

I was checking out the Theme Editor -- changing colors and add a logo image back and forth.

Now it's stuck in that state, so I see the same screen on different browsers.

It's not the first time this error happened, but I don't know how to revert back.

Thanks for help!