Markdown rendering seems to be failing.
Also markdown pages display a blank page in Beaker. There appears to be an injected stylesheet that is setting display: node on the pre that contains the rendered Markdown.

I don't see the switch between rendered and raw, from https://github.com/beakerbrowser/beaker/blob/d1ba6fe3329a07e593f9f0178d251cee71b3b6ac/app/markdown-renderer.js#L16 and the body only looks to contain the rendered markdown.
Also looks as if the JSON rendering is having a similar problem...
This appears to be caused by an issue in the bundling of Beaker. Markdown rendering is done by injecting javascript into the page, and that .js is not being loaded successfully.
Looking into a solution.
Okay, fixed. Will try to put out another patch release tomorrow.
Thanks