I’ve customized the bb-theme with a dark background and white text. When I edit a page using the page builder, and edit an image, those colors are being used by the input boxes in the WordPress modal for image management, the edit options, and the media library. This makes it really hard, almost impossible, to read.
We are looking into this and will get back to you shortly. Meanwhile, do you mind sharing temp admin access to the site so we can check your backend? It looks like it requires some CSS snippets to fix it.